Posted 09 June 2011 - 04:21 AM
Posted 09 June 2011 - 05:00 AM
My .NETMF projects: .NETMF Toolbox / Gadgeteer Light / Some PCB designs
Posted 09 June 2011 - 06:27 AM
Your idea sounds much like a challenge.
Please answer the question that Stefan asked you, then answer to the followings:
- do you mean use a normal 30$ handheld multimeter, and interface it with a Netduino?
- are you going to realize a (relatively) high precision meter, or it's just a toy?
- do you need a sampling frequency relatively high (>= 5 per sec), or 1 Hz is enough?
Posted 09 June 2011 - 06:51 PM
Posted 10 June 2011 - 12:36 AM
Thank you for welcoming me to the Netduino Community! I really like how everyone here is very friendly and hopeful.
Hopefully my answers can help on what I am trying to achieve in this project:
What is it exactly that you want to measure?
-I would like it to be able to measure voltage, current and resistance
Do you mean use a normal 30$ handheld multimeter, and interface it with a Netduino?
-If possible, use a 30$ handheld multimeter and interface it to use an Netduino. Use it to interface with Matlab to Visual see the measurement and possible use the SD card to store the readings.
Are you going to realize a (relatively) high precision meter, or it's just a toy?
-I would like it to be relatively high precision but if it becomes a toy that would be also cool.
Do you need a sampling frequency relatively high (>= 5 per sec), or 1 Hz is enough?
-I would like a sampling frequency relatively high (>=5 per sec). If it becomes a toy then 1hz would be enough
Hopefully this help. Thanks in advance
You can buy several DMMs that have serial (RS232) interfaces. In fact I have one from Radio Shack that I paid about $30 for several years ago.
Since the Netduino has a serial port, you can connect the meter to that port. You may or may not need a level shifter (such as a MAX232 chip) between the meter's serial port and the Netduino depending on the voltage level of the DMMs serial port. Check the specific meter you are considering.
Once you have the Netduino talking to the DMM it is relatively straightforward to log data to the SD card etc.
Posted 10 June 2011 - 07:42 AM
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