I’m new to E220 and trying to work with it using Arduino Pro Micro (5V). I’ve made connections as instructed here, but since Arduino Pro Micro doesn’t have 3.3V output and I have few spare DC-DC step-down 3.3V converters, I added one to convert 5V to 3.3V (also instead of using 2k and 1k resistors, I used 1.8k and 3.6k which I found my storage box).
Unfortunately it seems that it doesn’t work, error (12 – no response from device) is shown. When using the same E220 device with my another Arduino Pro Mini (3.3V) with more simpler connections, everything works smoothly. I’ve checked the connections and everything should be fine based on my understanding.
Here’s the full trace:
No response from device! (Check wiring)
HEAD : 0 0 78
Thanks for guidance! I removed dc-dc step-down converter and connected AUX, TXD and RXD from module through pull-up resistors to 5V. Unfortunately I still get the same message. I also tried to use my another module (which is working fine with Arduino Pro Mini) which doesn’t have voltage dividers at all (e.g. M0, M1 and RXD are connected directly), but it doesn’t change the situation.
I’ve checked with leds that pins 3-7 which I’m using to connect module from my Arduino Pro Micro work fine.
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