Alistair Olver
New Member
I have been looking at the 'Philip Callahan Soil Test Meter' from 'Pikeagri' at the following links **broken link removed** and https://www.electro-tech-online.com/custompdfs/2010/05/PCSM20-20Phil20Callahan20Soil20Meter.pdf.
Does anyone know of a circuit I could use to build a similar machine?
Thanks
Alistair
Does anyone know of a circuit I could use to build a similar machine?
Thanks
Alistair