MicroMod Asset Tracker Carrier Board Hookup Guide

Pages
Contributors: El Duderino, PaulZC
Favorited Favorite 0

Hardware Overview

The MicroMod Asset Tracker has a lot going on so buckle up. In this section we'll cover the various components and hardware included on the Asset Tracker.

Common Components

Most SparkFun MicroMod Carriers will have some common components and all MicroMod Carriers will have the keyed M.2 MicroMod Connector to plug your processor into. The photo and list below outline some of the components you can expect on most SparkFun MicroMod Carriers.

  • M.2 MicroMod Connector - This special keyed M.2 connector lets you install your MicroMod Processor of choice on your Asset Tracker Carrier Board.
  • USB-C Connector - Connect to your computer to program your Processor and also can provide power to your MicroMod system.
  • 3.3V Regulator - Provides a regulated 3.3V and sources up to 1A.
  • Qwiic Connector - The standard Qwiic connector so you can add other Qwiic devices to your MicroMod system.
  • Boot/Reset Buttons - Push buttons to enter Boot Mode on Processor boards and to Reset your MicroMod circuit.
  • microSD Slot - Insert a microSD card for reading and writing data.
  • RTC Battery - We've included a 3V Lithium Rechargeable Battery as a backup power source for the Processor Board Real Time Clock (if present).

Annotated photo of common components.

u-blox SARA-R510M8S

The heart of the Asset Tracker is the SARA-R510M8S module from u-blox. This module does so much, it is difficult to know where to begin!

Photo highlighting SARA-R5 module, SMA connectors, SIM slot and SARA On button.

Note: The MicroMod Asset Tracker uses the "00B" product version of the SARA-R5 module (specifically the SARA-R510M8S-00B-00). LTE NB-IoT Radio Access Technology, and the LTE FDD bands: 66, 71, 85 are not supported by this version. Refer to the SARA-R5 datasheet for more information.

Designed to last an IoT lifetime, this module is 5G-ready with the u-blox UBX-R5 chipset. It has built-in end-to-end security with hardware-based root of trust inside a discrete secure element. It provides a full security suite with foundation, design and end-to-end security, as well as access control. The built-in u‑blox M8 GNSS receiver provides accurate and reliable positioning, always and everywhere. It is optimized for ultra-low power consumption and critical firmware updates can be delivered and services enabled via uFOTA (Firmware Over The Air). There. We told you it did a lot!

The SARA-R5 supports many different forms of data communication from full TCP/IP sockets and packet switched data, through HTTP Get/Put/Post, FTP (the SARA has a built-in file system), Ping, to good old SMS text messaging! The built-in GNSS receiver provides NMEA format data and our library looks after the parsing for you.

The connection between the SARA-R5 and the MicroMod Processor Board is serial (3.3V UART) but again, with this module being so clever, it can communicate over two serial interfaces at the same time. Want your LTE data on one interface and your GNSS data on a separate interface? It can do that too!

Note: Only some of our MicroMod Processors fuly support dual serial interfaces. If this is an important feature for you please see the "Choosing a Processor Board" section below for more details.

LTE and GNSS connections are via separate, robust SMA connectors. Switchable 3.3V power for an active antenna is available on the GNSS connector. The Asset Tracker includes a socket for a Nano SIM.

If you need to, you can manually turn the SARA off by pushing and holding the SARA On button. The SARA will disconnect from the network before going into low power sleep. Press the button briefly to turn the SARA back on again.

ICM-20948 IMU

The Asset Tracker carries the same ICM-20948 9-Degree Of Freedom Inertial Measurement Unit as OpenLog Artemis. It can provide fast accelerometer, gyro and magnetometer data and can be configured for “Wake On Motion” too. We have a WOM example ready to go. It has a built-in temperature sensor too.

Photo highlighting the ICM-20948 IMU.

Digital Microphone

Thieves are wily these days. When attempting to steal your asset, one of the first things they will do is cover or break the antenna (if they can see it). The built-in SPH0641 digital microphone can be used to send an alert as soon as the Asset Tracker hears the thieves coming!

Photo highlighting the digital microphone.

Battery Charging and Monitoring Circuit

Since many applications for the Asset Tracker involve a battery-powered circuit, the board includes both the MCP73831 LiPo battery charger and the MAX17048 battery fuel gauge. The MCP7381 Single-cell charge management IC can deliver a charge current up to 500mA. The MAX17048 is a low-power I2C fuel gauge to monitor your battery's remaining charge.

Photo highlighting the LiPo connector, charger and fuel gauge.

Plated Through-Hole (PTH) Connections

GPIO PTHs

We've broken out dedicated PTHs for digital, analog, pulse width modulation (PWM), I2C and SPI along the sides of the Asset Tracker Carrier Board. You may also notice that we've included a ground rail next to the digital, analog and PWM pins.

Photo highlighting the GPIO PTH header.

Power PTHs

We've also provided PTHs for monitoring and accessing the following power circuits:

  • VIN - The power rail fed by USB-C and/or the LiPo battery.
  • 3.3V - The regulated 3.3V rail which feeds most of the components on the board. You can measure the 3.3V current draw using the MEAS pins (see below).
  • VCCIO - This is the 1.8V rail generated by the SARA-R5. We use it to power the 1.8V to 3.3V level shifters for the UART and I2C connections.
  • 1.8V - This is the 1.8V rail which powers the IMU. You can disable it by pulling the MicroMod G4 digital pin LOW.
  • RST - Pull this low to reset the MicroMod Processor and the SARA-R5.

Photo highlighting the power PTH header.

SARA-R5 PTHs

The following SARA-R5 I/O connections are also broken out to PTH headers:

  • NI - This is the SARA's Network Indicator signal. It will be low (0V) when the network is available, and high (3.3V) when the network is not available.
  • TP - This is the Timing Pulse (1PPS) signal and is connected to SARA GPIO6/TP. It will pulse low and high when the SARA is receiving a GNSS signal and the timing pulse has been enabled. Please see Example11 for more details.
  • SARA USB D-/D+/DET - These PTHs provide access to the SARA's diagnostic USB port. This connection is only used to access the SARA's trace log. You cannot (currently) upgrade the SARA via this interface. Please consult the SARA R5 Integration Manual for more details.
  • SARA I2C - These 3.3V (level-shifted) PTHs can be used to access the SARA's I2C bus. Some models of the SARA-R5 use I2C to communicate with an external GNSS module. As the SARA-R510M8S has GNSS built-in, it is unclear what you might want to use them for. But, we've been diligent and have broken them out anyway!

Photo highlighting the SARA-R5 PTH pins.

SWD Programming Pins

An unpopulated JTAG footprint is available for more advanced users who need breakpoint level debugging. Note that this is not populated so you will need a compatible header and compatible JTAG programmer to connect.

Photo highlighting the JTAG footprint.

Solder Jumpers

If you have never worked with solder jumpers and PCB traces before or would like a quick refresher, check out our How to Work with Solder Jumpers and PCB Traces tutorial for detailed instructions and tips.

On the rear of the board, you will find a large number of jumpers which you can use to connect and disconnect several of the connections between the SARA and the MicroMod Processor:

Photo highlighting the solder jumpers on the Asset Tracker

Having trouble seeing the detail in the photo? Click on it for a larger view.


The tables below outline all of the jumpers on the Asset Tracker along with brief descriptions of their functionality.

Jumper Name/Label Description Default State Notes
G0 / SD CS Ties the µSD Chip Enable to G0 CLOSED
G1 / SD PWR Toggles 3.3V to control power the µSD card. CLOSED Open to isolate G1. µSD will default to always on.
G2 / LTE_PWR Connects G2 to the SARA-R5 ON signal via a level-shifting circuit. CLOSED Allows G2 to function in the exact same way as the SARA On button. Cut the jumper to isolate G2 if required.
G3 / IMU PWR When closed, G3 can be used to control power for the IMU via software. By default, IMU power is always on. OPEN On the ESP32 Processor G3 is linked directly to the processor's TX1 pin. Leave the G3 jumper OPEN if you are using the ESP32 Processor or else serial communication with the SARA will not work.
G4 / RI When closed, connects G4 to the SARA-R5's Ring Indicator pin. OPEN On the ESP32 Processor, G4 is shared with the processor's RX1 pin. Similarly, G4 is shared with SPI CIPO on the RP2040 Processor. Leave this jumper OPEN if using either Processor to avoid serial communication errors with the SARA.
G5 / SARA INT When closed, connects G5 with either the SARA-R5's Interrupt I/O pin or the SARA's GPIO3 I/O pin depending on the state of the EXT INT / GPIO3 dual jumper (covered below). OPEN On the RP2040 Processor, G5 is shared with SPI Chip Select line. Closing the jumper will interfere with the SPI bus on the RP2040 Processor.
G6 / SARA ON When closed, this jumper allows G6 to monitor if the SARA power is on. OPEN This signal is different to the SARA On push-button. On the RP2040 Processor, G6 is shared with the SPI Clock line. Closing this jumper will interfere with the SPI bus on the RP2040 Processor.
G7 / DSR When closed, connects G7 to the SARA's DSR signal. OPEN On the RP2040 Processor, G7 is shared with the SPI COPI line. Leave this jumper open to avoid interfering with the SPI bus on this processor.
PDM DAT Connects the data signal from on-board microphone to AUD_LRCLK (MicroMod Pad 52). CLOSED On the RP2040 Processor, AUD_LRCLK is shared with CTS1. Open this jumper to use the CTS connection on the SARA.
PDM CLK Connects the clock signal from the on-board microphone to AUD_BCLK (MicroMod Pad 50). CLOSED On the RP2040 Processor, AUD_BCLK is shared with RTS1. Open this jumper to use the RTS connection on the SARA.
I2C A dual jumper that ties SDA & SCL on the primary I2C/Qwiic bus to 3.3V via a pair of 2.2kΩ resistors. CLOSED Open both jumpers to disconnect the pull-ups.
SARA I2C A dual jumper that ties the SARA's SDA and SCL lines to 3.3V via a pair of 2.2kΩ CLOSED Open both jumpers to disable the pull-ups.
CIPO Ties SPI CIPO/SDI to 3.3V via a 2.2kΩ resistor. CLOSED Open to disconnect the pull-up. Opening this jumper may be advantageous for very low power applications where Processors like the Artemis have internal pull-ups which can be used instead.
EXT INT / GPIO3 A dual jumper used to select which signal is connected to MicroMod G5. SEE NOTE By default, this jumper is set so if the G5 / SARA INT jumper is closed, G5 is connected to the SARA EXT INT I/O pin. Switch this jumper to the opposite side to connect G5 to the SARA GPIO3 pin.
DSR A dual jumper used to control the direction of DSR from input to output . SEE NOTE By default, this jumper sets DSR as an input. Switching it sets DSR as an output so users can use dual-UART communication modes on the SARA.
MEAS Allows users to measure the current draw from the 3.3V power rail. CLOSED Open this jumper and complete the circuit using a digital multimeter to measure current draw on the 3.3V power rail.
VIN/3 Completes the VIN/3 voltage divider circuit. CLOSED Open the jumper to disable the VIN/3 voltage divider circuit. Disabling this can be useful in very low power applications to reduce total current draw.
3V3 (LED) Connects the anode of the 3.3V LED to 3.3V via a 1kΩ resistor. CLOSED Open the jumper to disable the 3.3V LED to reduce total current draw of the MicroMod circuit.
VIN (LED) Connects the anode of the VIN LED to VIN (5V if powered by USB, 3.7V nominal if powered by LiPo battery) via a 4.7kΩ resistor. CLOSED Open the jumper to disable the VIN LED to reduce the total current draw of the MicroMod circuit.
ICM_INT Connects the ICM IMU Interrupt pin to the primary I2C Interrupt pin (I2C_INT) on the MicroMod connector. CLOSED Open the jumper to isolate the MicroMod I2C_INT pin from the ICM-20948. On the RP2040 Processor, I2C_INT is shared with TX2. You may need to open this jumper to use the DTR handshake signal.
Jumper Name/Label Description Default State Notes
V USB Connects VUSB_DET on the SARA's diganostic (trace log) USB port to V_USB (5V OPEN Important! You must not have a Processor installed to use the diagnostic USB port.
USB D+ Connects USB_D+ on the SARA's diagnostic (trace log) USB port to USB_D+ on the USB-C connector. OPEN Important! You must not have a Processor installed to use the diagnostic USB port.
USB_D- Connects USB_D- on the SARA's diagnostic (trace log) USB port to USB_D- on the USB-C connector. OPEN Important! You must not have a Processor installed to use the diagnostic USB port.
VE When closed, allows the Processor to disable the main 3.3V regulator via the 3.3V_EN pin. OPEN Recommended only for very low power applications. The Processor can draw power from the RTC battery while the voltage regulator is disabled.
BYP Bypasses the 6V/2A fuse and nets VIN and V_USB together. OPEN The "penny-in-the-fuse" jumper. Close only if you know what you are doing!

MicroMod Pinout

Wondering what the pins are that are broken out on the MicroMod Asset Tracker Carrier Board? The tables below outline the Asset Tracker pinout as well as the general MicroMod pinout. Remember to compare the pins against your Processor Board to determine which pins are available.

Note: You may not recognize the COPI/CIPO labels for SPI pins. SparkFun is working to move away from using MISO/MOSI to describe signals between the controller and the peripheral. Check out this page for more on our reasoning behind this change.
AUDIO UART GPIO/BUS I2C SDIO SPI0 Dedicated
M.2 Connector Pin# MicroMod Pin Name Asset Tracker Connection Description
1 GND GND Ground plane.
2 3.3V 3.3V Regulated 3.3V via USB-C.
3 USB_D+ Passthrough USB D+ connection for Processor Board.
4 3.3V_EN 3.3V Enable Voltage regulator enable input.
5 USB_D- Passthrough USB D- connection for Processor Board.
6 RESET RESET Button Connected to RESET Button. Reset is active LOW
9 USB_VIN VIN Input voltage from USB.
10 D0 SPI PTH CS/D0 PTH SPI Chip Select for SPI PTH Header. D0 also broken out for I/O PTHs
11 BOOT BOOT Button Connected to BOOT Button. Boot is active LOW.
12 I2C_SDA I2C_SDA I2C data for Fuel Gauge & Qwiic connector
13 UART_RTS1 SARA RTS_I UART Request to Send for SARA
14 I2C_SCL I2C_SCL I2C clock for Fuel Gauge & Qwiic connector
15 UART_CTS1 SARA CTS_O UART Clear to Send for SARA
16 I2C_INT# IMU INT IMU Interrupt pin
17 UART_RX1 SARA TXD_O SARA UART Data Iutput
18 D1 D1 General digital I/O PTH
19 UART_TX1 SARA TXD_I SARA UART Data Output
20 UART_RX2 SARA DCD_O/RXD2_O SARA UART Data Carrier Detect / AUX UART Data Output
21 SWDCK SWDCK Serial Wire Debug Clock
22 UART_TX2 SARA DTR_I/TXD2_I SARA UART Data Terminal Ready / AUX UART Data Input
23 SWDIO SWDIO Serial Wire Debug I/O
32 PWM0 PWM0 PWM0 PTH
34 A0 A0 A0 PTH (Input Only)
34 A1 A1 A1 PTH (Input Only)
40 G0/BUS0 SD CS General purpose pin configured for Chip Select on µSD.
42 G1/BUS1 microSD_PWR General purpose pin configured for µSD Power Enable
44 G2/BUS2 LTE_PWR_ON General purpose pin configured for turning SARA on/off
46 G3/BUS3 ICM_PWR General purpose pin configured for controlling IMU power
48 G4/BUS4 SARA RI_O/CTS2_O SARA UART Ring Indicator / AUX UART Clear to Send
49 BATT_VIN/3 VIN/3 Divided input voltage for monitoring power supply.
50 AUD_BCLK I2S_SCK/PDM_CLK Microphone PDM clock signal
51 I2C_SDA1 SARA I2C SDA SARA I2C data signal
52 AUD_LRCLK I2S_WS/PDM_DAT Microphone PDM data signal
53 I2C_SCL1 SARA I2C SCL SARA I2C clock signal
55 SPI_CS# ICM_CS Chip select for IMU level shifting IC
57 SPI_SCK SPI_SCK SPI Clock
59 SPI_COPI SPI_SDO SPI controller out/peripheral in
61 SPI_CIPO SPI_SDO SPI controller in/peripheral out
69 G7/BUS7 SARA DSR_O/RTS2_I SARA UART Data Set Ready / AUX UART Request to Send
71 G6/BUS6 SARA_ON General purpose pin conifgured to monitor power for SARA
72 RTC_3V RTC_3V 3V output for backup battery charging.
73 G5/BUS5 SARA_INT General purpose pin configured for SARA Interrupt I/O pin
74 3.3V 3.3V 3.3V output from voltage regulator
Function Bottom
Pin
   Top   
Pin
Function
(Not Connected) 75 GND
3.3V 74 73 G5 / BUS5
RTC_3V_BATT 72 71 G6 / BUS6
SPI_CS1# SDIO_DATA3 (I/O) 70 69 G7 / BUS7
SDIO_DATA2 (I/O) 68 67 G8
SDIO_DATA1 (I/O) 66 65 G9 ADC_D- CAM_HSYNC
SPI_CIPO1 SDIO_DATA0 (I/O) 64 63 G10 ADC_D+ CAM_VSYNC
SPI COPI1 SDIO_CMD (I/O) 62 61 SPI_CIPO (I)
SPI SCK1 SDIO_SCK (O) 60 59 SPI_COPI (O) LED_DAT
AUD_MCLK (O) 58 57 SPI_SCK (O) LED_CLK
CAM_MCLK PCM_OUT I2S_OUT AUD_OUT 56 55 SPI_CS#
CAM_PCLK PCM_IN I2S_IN AUD_IN 54 53 I2C_SCL1 (I/O)
PDM_DATA PCM_SYNC I2S_WS AUD_LRCLK 52 51 I2C_SDA1 (I/O)
PDM_CLK PCM_CLK I2S_SCK AUD_BCLK 50 49 BATT_VIN / 3 (I - ADC) (0 to 3.3V)
G4 / BUS4 48 47 PWM1
G3 / BUS3 46 45 GND
G2 / BUS2 44 43 CAN_TX
G1 / BUS1 42 41 CAN_RX
G0 / BUS0 40 39 GND
A1 38 37 USBHOST_D-
GND 36 35 USBHOST_D+
A0 34 33 GND
PWM0 32 31 Module Key
Module Key 30 29 Module Key
Module Key 28 27 Module Key
Module Key 26 25 Module Key
Module Key 24 23 SWDIO
UART_TX2 (O) 22 21 SWDCK
UART_RX2 (I) 20 19 UART_RX1 (I)
CAM_TRIG D1 18 17 UART_TX1 (0)
I2C_INT# 16 15 UART_CTS1 (I)
I2C_SCL (I/0) 14 13 UART_RTS1 (O)
I2C_SDA (I/0) 12 11 BOOT (I - Open Drain)
D0 10 9 USB_VIN
SWO G11 8 7 GND
RESET# (I - Open Drain) 6 5 USB_D-
3.3V_EN 4 3 USB_D+
3.3V 2 1 GND
Signal Group Signal I/O Description Voltage
Power 3.3V I 3.3V Source 3.3V
GND Return current path 0V
USB_VIN I USB VIN compliant to USB 2.0 specification. Connect to pins on processor board that require 5V for USB functionality 4.8-5.2V
RTC_3V_BATT I 3V provided by external coin cell or mini battery. Max draw=100μA. Connect to pins maintaining an RTC during power loss. Can be left NC. 3V
3.3V_EN O Controls the carrier board's main voltage regulator. Voltage above 1V will enable 3.3V power path. 3.3V
BATT_VIN/3 I Carrier board raw voltage over 3. 1/3 resistor divider is implemented on carrier board. Amplify the analog signal as needed for full 0-3.3V range 3.3V
Reset Reset I Input to processor. Open drain with pullup on processor board. Pulling low resets processor. 3.3V
Boot I Input to processor. Open drain with pullup on processor board. Pulling low puts processor into special boot mode. Can be left NC. 3.3V
USB USB_D± I/O USB Data ±. Differential serial data interface compliant to USB 2.0 specification. If UART is required for programming, USB± must be routed to a USB-to-serial conversion IC on the processor board.
USB Host USBHOST_D± I/O For processors that support USB Host Mode. USB Data±. Differential serial data interface compliant to USB 2.0 specification. Can be left NC.
CAN CAN_RX I CAN Bus receive data. 3.3V
CAN_TX O CAN Bus transmit data. 3.3V
UART UART_RX1 I UART receive data. 3.3V
UART_TX1 O UART transmit data. 3.3V
UART_RTS1 O UART request to send. 3.3V
UART_CTS1 I UART clear to send. 3.3V
UART_RX2 I 2nd UART receive data. 3.3V
UART_TX2 O 2nd UART transmit data. 3.3V
I2C I2C_SCL I/O I2C clock. Open drain with pullup on carrier board. 3.3V
I2C_SDA I/O I2C data. Open drain with pullup on carrier board 3.3V
I2C_INT# I Interrupt notification from carrier board to processor. Open drain with pullup on carrier board. Active LOW 3.3V
I2C_SCL1 I/O 2nd I2C clock. Open drain with pullup on carrier board. 3.3V
I2C_SDA1 I/O 2nd I2C data. Open drain with pullup on carrier board. 3.3V
SPI SPI_COPI O SPI Controller Output/Peripheral Input. 3.3V
SPI_CIPO I SPI Controller Input/Peripheral Output. 3.3V
SPI_SCK O SPI Clock. 3.3V
SPI_CS# O SPI Chip Select. Active LOW. Can be routed to GPIO if hardware CS is unused. 3.3V
SPI/SDIO SPI_SCK1/SDIO_CLK O 2nd SPI Clock. Secondary use is SDIO Clock. 3.3V
SPI_COPI1/SDIO_CMD I/O 2nd SPI Controller Output/Peripheral Input. Secondary use is SDIO command interface. 3.3V
SPI_CIPO1/SDIO_DATA0 I/O 2nd SPI Peripheral Input/Controller Output. Secondary use is SDIO data exchange bit 0. 3.3V
SDIO_DATA1 I/O SDIO data exchange bit 1. 3.3V
SDIO_DATA2 I/O SDIO data exchange bit 2. 3.3V
SPI_CS1/SDIO_DATA3 I/O 2nd SPI Chip Select. Secondary use is SDIO data exchange bit 3. 3.3V
Audio AUD_MCLK O Audio master clock. 3.3V
AUD_OUT/PCM_OUT/I2S_OUT/CAM_MCLK O Audio data output. PCM synchronous data output. I2S serial data out. Camera master clock. 3.3V
AUD_IN/PCM_IN/I2S_IN/CAM_PCLK I Audio data input. PCM syncrhonous data input. I2S serial data in. Camera periphperal clock. 3.3V
AUD_LRCLK/PCM_SYNC/I2S_WS/PDM_DATA I/O Audio left/right clock. PCM syncrhonous data SYNC. I2S word select. PDM data. 3.3V
AUD_BCLK/PCM_CLK/I2S_CLK/PDM_CLK O Audio bit clock. PCM clock. I2S continuous serial clock. PDM clock. 3.3V
SWD SWDIO I/O Serial Wire Debug I/O. Connect if processor board supports SWD. Can be left NC. 3.3V
SWDCK I Serial Wire Debug clock. Connect if processor board supports SWD. Can be left NC. 3.3V
ADC A0 I Analog to digital converter 0. Amplify the analog signal as needed to enable full 0-3.3V range. 3.3V
A1 I Analog to digital converter 1. Amplify the analog signal as needed to enable full 0-3.3V range. 3.3V
PWM PWM0 O Pulse width modulated output 0. 3.3V
PWM1 O Pulse width modulated output 1. 3.3V
Digital D0 I/O General digital input/output pin. 3.3V
D1/CAM_TRIG I/O General digital input/output pin. Camera trigger. 3.3V
General/Bus G0/BUS0 I/O General purpose pins. Any unused processor pins should be assigned to Gx with ADC + PWM capable pins given priority (0, 1, 2, etc.) positions. The intent is to guarantee PWM, ADC and Digital Pin functionality on respective ADC/PWM/Digital pins. Gx pins do not guarantee ADC/PWM function. Alternative use is pins can support a fast read/write 8-bit or 4-bit wide bus. 3.3V
G1/BUS1 I/O 3.3V
G2/BUS2 I/O 3.3V
G3/BUS3 I/O 3.3V
G4/BUS4 I/O 3.3V
G5/BUS5 I/O 3.3V
G6/BUS6 I/O 3.3V
G7/BUS7 I/O 3.3V
G8 I/O General purpose pin 3.3V
G9/ADC_D-/CAM_HSYNC I/O Differential ADC input if available. Camera horizontal sync. 3.3V
G10/ADC_D+/CAM_VSYNC I/O Differential ADC input if available. Camera vertical sync. 3.3V
G11/SWO I/O General purpose pin. Serial Wire Output 3.3V

Board Dimensions

The Asset Tracker Carrier Board measures 3.0 inches by 3.0 inches (76.2mm x 76.2mm) and has four mounting holes that fit a 4-40 screw.

Asset Tracker Board Dimensions

Having trouble seeing the details in the image? Click on it for a larger view!