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Comments: How to Work with Jumper Pads and PCB Traces

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  • Member #544906 / about 6 months ago / 1

    I wasn't specific enough. I am using Seeed's Grove - I2C High Accuracy Temp&Humi Sensor (SHT35). Not Sparkfun's. I won't link to it since it's a different vendor. Anyway, it supports two addresses (0x44 and 0x45) via the jumpers and of course, if you want more than that on your bus, you'll have to use a multiplexer. Thanks for the tutorial. I'll check out the Sparkfun SHT35.

    • bboyho / about 6 months ago * / 1

      Ah, I see! I misread the number as SHTC3 instead of the SHT35. Thank you for the clarification.

  • Member #544906 / about 6 months ago / 1

    Thanks for posting this. I was having trouble getting a couple SHT35 temperature sensors working on an I2C bus after soldering the jumper pad on one of them to change the default address. The docs only said to add a solder blob across the pad but never mentioned cutting the other connection hiding below the pcb surface. Makes sense now but it was a first for me and was blocking me.

    • bboyho / about 6 months ago * / 1

      Hi!

      Looking at the SHTC3 tutorial, it looks like there is only one address for the SHTC3. The breakout board only includes jumpers for the pull-up resistors on the back and a LED jumper on the top. You might need to adjust the I2C jumper if the equivalent value for the pull-up resistors thought depending on how many are on the I2C bus. There are no jumpers for changing the SHTC3's default address. The tutorial did mention that you would need a multiplexor and to change the address of the SparkFun Qwiic Mux Breakout.

      ... If you have other I2C devices with the same address or wish to use multiple SHTC3 breakouts on a single I2C bus, you'll want to use a multiplexer/mux. If you need to use more than one SHTC3 sensor or other devices sharing the same address in your project, consider using the Qwiic Mux Breakout - 8-Channel. Note, the Qwiic Mux Breakout's default I2C address is also 0x70 so it must be adjusted to work properly with the SHTC3.

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