In my use of bistable latching relays, where the state of the relay position is information that must be tracked, I have found it to be easiest to use an optocoupler (H11AA1 or PC817C) to feedback the state of the relay position, which is polled at bootstrap. If you have multiple states to read at boot, you can use something like the TCA9548A multiplexer to accomplish the state read and to set your volatile state variables appropriately, and save on your μC pin count.
Thank you for your answer
I'm trying to compare with only pro mini and rfm69 on a test plate, and 2 AA batteries. I have strange result, and i'm doubting about my multimeter.
I'll continue testing and will tell you
Hi,
By the PCB silk I was wrongly thinking that the module could be on of "RFM69" or "RFM69H" or "RFM69W" and "RFM69HW".
Now if I understood correctly the diagram, the module can only be either the "RFM69W" (low power 13dBm) or the "RFM69HW" (high power 20dBm).
Since this module has the "H" marked it should be "RFM69HW" and that is confirmed by the other side of it, because it has the two additional black ICs.
Thanks!
