jonescg
100 MW
I'm thinking of mounting a pair of digital panel meters on the dash of the race bike. I'm very proud of the simplicity of my bike's display, so for the road-legal version I want it to be similarly simple, but I need a couple of vital stats up front like amps and volts.
Voltage:
In my case, 700 V is fully charged and 590 V is spent. So a voltage readout is a pretty close proxy for state of charge. In order to get a 700 V readout on the screen I need my voltage divider to give a value between 0 and 7.00 V, and with a bit of luck, remove the decimal point. Can anyone point me in the right direction? It needs to be fairly compact, like 16 mm tall x 40 mm wide. There are "1000 volt DC" panel meters available from e-bay which take the voltage reading directly, but I wouldn't put that kind of potential anywhere near them...
Edit - just found this: http://www.farnell.com/datasheets/684076.pdf looks like it can be adjusted based on a 0-5 V signal, which is what I have currently on the divider
Amps:
I have a 500 A digital panel meter which works with a 75 mV shunt. Trouble is, it's pretty big and I only need a small readout, like 16 mm tall and 40 mm wide. Any clues where I can find one? An analogue meter would look pretty cool, and can no doubt run from the shunt directly (no additional power supply needed).
Isolation - these digital panel meters all require a 7-20 V power supply to run the LCD, but the grounds are common, so I will power both from the isolating DC/DC converter I have up front.
Speed and odometer - I'm thinking of getting a 91 mm analogue speedo from Speedhut. They work by GPS, which is cool. Nice and simple.
So, does Digikey or Farnell sell simple and compact meters?
Voltage:
In my case, 700 V is fully charged and 590 V is spent. So a voltage readout is a pretty close proxy for state of charge. In order to get a 700 V readout on the screen I need my voltage divider to give a value between 0 and 7.00 V, and with a bit of luck, remove the decimal point. Can anyone point me in the right direction? It needs to be fairly compact, like 16 mm tall x 40 mm wide. There are "1000 volt DC" panel meters available from e-bay which take the voltage reading directly, but I wouldn't put that kind of potential anywhere near them...
Edit - just found this: http://www.farnell.com/datasheets/684076.pdf looks like it can be adjusted based on a 0-5 V signal, which is what I have currently on the divider
Amps:
I have a 500 A digital panel meter which works with a 75 mV shunt. Trouble is, it's pretty big and I only need a small readout, like 16 mm tall and 40 mm wide. Any clues where I can find one? An analogue meter would look pretty cool, and can no doubt run from the shunt directly (no additional power supply needed).
Isolation - these digital panel meters all require a 7-20 V power supply to run the LCD, but the grounds are common, so I will power both from the isolating DC/DC converter I have up front.
Speed and odometer - I'm thinking of getting a 91 mm analogue speedo from Speedhut. They work by GPS, which is cool. Nice and simple.
So, does Digikey or Farnell sell simple and compact meters?
