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Need advice on which board to use

Nik Pa

Hi Guys,

I am trying to build solar cell + inverter + SMPS voltage monitor.

The inputs are:

1. Solar PV cell voltage and current.
2. Input voltage from PT (potential transformer)
3. Current through CT (current transformer)
4. SMPS Voltage and Current.
5. Inverter status (on/Battery low/overload)

The outputs are:

1. SMPS switch (ON/OFF)
2. Inverter switch (ON/OFF and RESET)
3. RS232 interface
4. Ethernet
5. GPS
6. GSM/RF (for remote logging capability)
7. LCD
8. USB

The main point of this project is data logging ie. to be able to send an
update of the front-end (PV/inverter/SMPS) once every morning, every day
remotely. Also should be able to control the system (nos.1 and 2) remotely
i.e. through internet.

Based on this, which Keil board should I use? Any suggestions are welcome.

I had shortlisted the MCB1700 board but it does not have a GSM/RF chip in it.

Will it be possible to externally connect a GSM modem to it?

Thanks a lot for your help.

  • 0

    Any Keil board will do. Or look for boards from different manufacturer if you want to have a chance to find GPS + GSM modules already available - with the Keil boards you would normally have to use two serial ports for GPS + GSM.

    One alternative route would be to look at Arduino.

    Is your SMPS just for charging batteries? Or why have both an inverter (that normally supplies mains power) and a SMPS? The inverter part is often switched so a SMPS besides the inverter would make me think that the SMPS should supply a lower, DC, voltage.

  • 0 in reply to ImPer Westermark

    So how many ADC channels does this board have? It looks like only one?

  • 0 in reply to Nik Pa

    I have to assume you still talk about the Keil board.

    It has only one with a potentiometer. But you don't want potentiometers for your ADC. So then it falls back to how many analog inputs the processor has. So checking the user manual for LPC17xx you would at find 8 analog inputs. Not sure if there are any model with even more inputs.

    In the end, all you need are the raw analog inputs, since you still have to develop the interface electronics to get proper isolation and/or measurement range (and potentially filtering) for each of your measurement points.