Pimorini EnviroHaT mini LTR559 sensor not working with only I2C connection

Support
1

Hi,

I have a Enviro HaT mini from Pimorini. I wanted to use only sensor like BME280 and LTR559 for my project with Pico Hat mini connections so that I can plug in Automation Hat with main header.

When I connect enviro hat with the main header then light-procimity sensor works fine but if I want to use only 4-wire I2C connection then I get the error while accessing LTR sensor. The BME works though.

"OSError error 121 remote I/O error".

Are there some more pins the sensor could be using? The following link shows that the Hat uses 16 pins in total. I had tried connecting all 16 of them with wire but still the LTR sensor did not work. Does someone has an idea?

2

Just for confirmation, is it the Enviro pHat, Enviro, or Enviro+?

Best guess is your missing a ground connection. All the grounds with the black horseshoe shaped marker need to be connected.

3

@alphanumeric
I have Enviro HaT Mini.
I tried your trick,
With all the grounds connected----> No success
With 3.3 and both 5V pins connected-----> success!!

Thank you, and nice catch!!

4

Nice to hear you figured it out. You can plug multiple Hats in with this by the way.
pHAT Stack – Pimoroni