Hw Mayfly ECO R01
Summary: Superseded. Use ECO R04. Was: (Measure Vbat accurately with R divider on AA0. Cost is about 3uA through R+R divider. )
(this was used on one board sn:'MAYFLY160322' marked as part of rev:'0.5bR03')
Two 1M Resistors Leaded Through Hole ,1/8W eg RNF18FTD1M00 1% 100ppm
1 10nF (to 100nF) C sampling capacitor from GND to AA0. 10nF Cer Kemet C410C103K5R5TA7200 or Vishay K103K10X7RF5UH5
OneShort 2.5" wire wrap wire, stripped both ends approx 1/8" and 1/4"
Shrink wrap as needed, for protection (?1/8" & 1/4" )
- Wind the resistors as shown, and solder one end to to 1/4" stripped
- Solder JP2 - GND
- Solder JP2 - Vbat
- Solder wire wrap 1/4" to AA0 and cut off excess
