ETMoody3
Member

The library examples compile for me for all 32 bit Teensy boards. You should know in advance that it is relatively easy to destroy these units by setting the gain too high or ... uhm... feeding the card reverse...

Im interested. I just obtained reflow soldering equipment, looks like good practice. Thanks in advance

^ This is why I don't say much here.

That circuit was copied from the sim800L datasheet ( cellphone chip) and is definitely an extreme measure... but it works. I also use MG Chemicals' 841AR nickel conductive shield paint to good result for blocking...

Try the usual decoupling capacitor voodoo, large ground plane, diodes.. Noise killing appears to me to be more alchemy than science. This is from a cellphone project, the frequencies you're encountering may...

Also... LM358 may not be your best choice powered by the teensy. Id try a TS922. Low power, rail to rail tolerant, very low noise.

Long shot, if you still have issue after checking for ground loops: Try lowering the current to the electrodes to a minimum that still allows function. Register 0x5C default is 0x20. Try 0x19, 0x18, etc. Steps...