E220 with Arduino Pro Micro and Step-down DC converter

[jussiv]

Hi!

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)
12
—————————————-
HEAD : 0 0 78

AddH : 65
AddL : 64

Chan : 114 -> 524MHz

SpeedParityBit : 0 -> 8N1 (Default)
SpeedUARTDatte : 1 -> 2400bps
SpeedAirDataRate : 0 -> 2.4kbps

OptionSubPacketSett: 1 -> 128bytes
OptionTranPower : 0 -> 22dBm (Default)
OptionRSSIAmbientNo: 1 -> Enabled

TransModeWORPeriod : 1 -> 1000ms
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeFixedTrans: 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
—————————————-
Hi, I’m going to send message!
Success
”

Is there possibility to debug what might be the problem? Or do you think that this step-down converter is for some reason anyhow bad idea?

Here’s image of the connections if it helps anyhow.

Thanks a lot for the help in advance!

[Renzo Mischianti]

Hi Jussiv,
as a test, try to connect all at 5v, the device needs a big use to be damaged from 5v logic level.
Bye Renzo

[jussiv]

Hi!

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.

[Renzo Mischianti]

Hi jussiv,
if It does not work with a direct connection, the problem can be only the wiring with respect to the configuration. Try to check It again.
Bye Renzo

[jussiv]

Hi!

Thanks for guidance!

For some reason I wasn’t able to get it working easily, so I changed my Pro Micro to another Pro Mini and same wiring than another Pro Mini. Now it works well!

Now it is time to check how long signal will reach. Thank you so much for great library!

[Author]

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