03-03-2018, 21:39
(03-03-2018, 20:35)garybb1 Wrote: Hi
I am intending on using an SHT21 as my main temp sensor which has a max operating voltage of 3.6V
From looking at the schematic it looks to me as though jumper 1 sets the voltage for the VCC terminal of the I2C connections on the TX but not the SHT21/EI2C terminals.
If I want to use the SHT21/EI2C terminals for a longer cable run how is the voltage dropped to 3V ?
Thanks for any help anyone can offer
Do you have a picture or link to the SHT21 module you are using?
Even if you grab the 3.3V from the Arduino 3.3V pin, keep in mind that the SDA and SCL lines have pull up resistors to 5V, so at least the sensor should be tolerant to this.