anchor.diff:  
       led-on
   
  -    debug if
  +    DEBUG if
         show-readings cr 1 ms
       else
         send-packet
  
positive.code: : low-power-sleep
    rf69-sleep
    -adc \ only-msi
    rate 0 do stop1s loop
    hsi-on adc-init ;
  
  : main
  
negative.code: \ application setup and main loop
  \ assumes that the BME280 and TSL4531 sensors are connected to PB6..PB7
  
  0 constant DEBUG  \ 0 = send RF packets, 1 = display on serial port
  10 constant RATE  \ seconds between readings
  
  : show-readings ( vprev vcc tint lux humi pres temp -- )
    hwid hex. ." = "
  