Does someone have an "EXAMPLE CIRCUIT" that is running on MBED that can take 0-30VDC and input into one of the MBED ADC pins (P15-P20) with "ADCinput" example code?

I would like to read 5 "INPUT" voltages from a source 0-30V into the MBED hardware them read the results and output to Pachube :

* HARDWARE - Really looking for "simple input circuit 0-30V" into MBED ADC. (ISOLATED not to blow the MBED would be nice...)

* SOFTWARE - Really looking for simple example code that reads the results of "0-30VDC" circuit that inputs into the P15-P20 MBED ADC.

Thanks!

Jeff

Solar Bank #1	-4.478255	Volts (V)	3 months | 4 days | 24 hours | last hour embed,history,triggers,etc
2	Solar Bank #2	-1.544096	Volts (V)	3 months | 4 days | 24 hours | last hour embed,history,triggers,etc
3	Charge Controller	-3.031838	Volts (V)	3 months | 4 days | 24 hours | last hour embed,history,triggers,etc
4	Battery Bank	-2.742555	Volts (V)	3 months | 4 days | 24 hours | last hour embed,history,triggers,etc
5	Grid Tie Inverter	-1.006855	Volts (V)	3 months | 4 days | 24 hours | last hour embed,history,triggers,etc

and if you need help on the resistor divider too see here

Andy,

I will try it!

Do you have code that I can use to read voltages (0-3.3V) on P15-P20 and and output results linear over 0-40V?

Thanks!  Jeff

Thanks Christian!

I will add 1N5338 Zener 5.1V 5W 5%

Jeff

If you want isolation, you can try an isolation amplifier (i.e. ISO122). The gain for that one is 1 and you need a power supply on both sides. You would still need to use a voltage divider because the amplifier can't take the full 0-30 volts.