Using OpenSegment
Nate 
Counter/Analog Modes
OpenSegment has three modes:
- Data mode (where you send commands and data over Serial/SPI/I2C)
- Counter mode (count up/down based on SDI/SDO)
- Analog meter mode (display analog voltages on A6/A7)
We’ve covered the basic data mode; let’s cover the other two modes.
To control the mode of the display, send the command 0x82 over serial followed by:
- 0 for data mode
- 1 for analog meter mode
- 2 for counter mode
An example of how to do this over serial is available here.
You do not need to solder the jumper to control the mode. Please read the solder jumper section below for more information.
Counter Mode
When the display is in Counter mode, the display will increase by one every time the SDI pin (i is for increase!) is pulled low and will decrease by one every time the SDO pin is pulled low. This mode was created to monitor and count the number of times a button is pressed or a reed switch is closed. The display must be power cycled to reset the count.
Analog Meter Mode
When the display is in Analog mode the instantaneous analog voltage on pins A7 and A6 will be shown on the display with 1/10th volt resolution (0.0V to 5.0V).
The voltage on A6 is displayed on the left and A7 is displayed on the right. This mode was created to monitor basic voltages (0 to 5V) without the need of a multimeter.
Solder Jumpers
You can use OpenSegment as a counter and as an analog meter without any software configuration. By closing a solder jumper on the back of the display OpenSegment will enter one of two modes: Counter or Analog Meter mode.
Closing a solder jumper will override any software settings and will force the display into that mode after power up. If both jumpers are closed the display will startup in Counter mode.