Hi there,

I'd like to create a low-power, battery driven soil moisture sensor (I'm already using many battery powered mysensor nodes)
and wonder what would be better:

1. I2C - not sure about the deep sleep consumption here
   https://www.tindie.com/products/miceuz/i2c-soil-moisture-sensor/

2. Analog (Standard Aliexpress Sensor, found a power consumption spec on this page)
   https://www.dfrobot.com/wiki/index.php/Capacitive_Soil_Moisture_Sensor_SKU:SEN0193

Does anyone have experience with these? I'm not sure if they can be easily turned off when sleeping e.g. if I connect them to
a digital out and switch it?
What would you use?

Thanks a lot!
Christoph

Hi there,

I'd like to get a Wemos D1 Mini running with a RFM69HC, but I have no idea how to do this.

I've wired it like this:
MISO > D6
MOSI > D7
NSS > D8
SCK > D5
DIO0 > D2

But can anyone tell me how to adapt the code for it ( IRQ etc)?

well - the blog post I used for the wiring missed the detail that the RFM69 does not seem to be 5V tolerant (inputs).

Can anyone tell me:

a) if it is damaged if the inputs had 5V
b) how I can adjust the levels, can I do this with resistors or do I need more?

Hi there, maybe someone here can help me:

I've got two RFM69HC 434Mhz, connected to two Arduino Nano 3 clones.

The code I use for testing is this:
https://gist.github.com/solars/44b2398e62d07e29314538a70579663f
(it's from sparkfun: https://learn.sparkfun.com/tutorials/rfm69hcw-hookup-guide/running-the-example-code)

When I enter something in the serial console it seems to be sending. The LED flashes quickly.
However, there is nothing received on the other side. If I eneable ACK I just get the 'no ack received' msg.

Can anyone spot the problem? Is it maybe because I don't have a HCW, any settings wrong?

Thank you very much