I am looking for a 4 digit LED or LCD panel that can measure and display Volt and Ampere on two different rows, typical range around 0-50 Volts and 0-10 Amps for an upcoming DIY adjustable bench PSU, anyone aware of any DIY V/A meter project one can modify and build on, or hinting on some suitable components like what kind of uC (PIC, Arduino..?) with built in 2ch ADC that could fill the function, or whether there are some dedicated all in one chips, alternatively a ready made display from eBay etc., although the DIY challenge allures me more.
The only one suitable display found on eBay, AliExpress, BangGood is a generic model sold in the multitudes usually for ~5$€£, but the digits are tiny, if I understood the info it says 0,28" (= 7mm) that's the height, but sure these 7 segment LED's could easily be changed for much larger ones.
DC 0-200V 10A 4 Bit 5 wires Amp Dual Digital Blue + Red LED Voltmeter Ammeter
https://www.ebay.com/itm/264505980309
https://www.ebay.com/usr/technicalaim
BTW found an LCD too, but not sure if it's 4 digit capable although the pictures indicates so, the info is a bit scares.
DC 5-24V Voltage Current Meter Detection LCD Display Ammeter Voltmeter DC 0-100V
https://www.ebay.com/itm/274447916721
https://www.ebay.com/usr/modul_technik
Below some LCD's, like them and they have 'V' and 'A' letter in the display but unfortunately it's AC only.
AC 40-400V 100A Digital Voltage Ampere Panel Meter 220V 110V Ammeter Voltmeter
https://www.ebay.com/itm/402895802827
https://www.ebay.com/usr/technicalaim
AC 40-400V 100A Digital Voltage Current Power Factor Meter Voltmeter Amperemeter
https://www.ebay.com/itm/233975732084
https://www.ebay.com/usr/elezone17
The only one suitable display found on eBay, AliExpress, BangGood is a generic model sold in the multitudes usually for ~5$€£, but the digits are tiny, if I understood the info it says 0,28" (= 7mm) that's the height, but sure these 7 segment LED's could easily be changed for much larger ones.
DC 0-200V 10A 4 Bit 5 wires Amp Dual Digital Blue + Red LED Voltmeter Ammeter
https://www.ebay.com/itm/264505980309
https://www.ebay.com/usr/technicalaim
BTW found an LCD too, but not sure if it's 4 digit capable although the pictures indicates so, the info is a bit scares.
DC 5-24V Voltage Current Meter Detection LCD Display Ammeter Voltmeter DC 0-100V
https://www.ebay.com/itm/274447916721
https://www.ebay.com/usr/modul_technik
Below some LCD's, like them and they have 'V' and 'A' letter in the display but unfortunately it's AC only.
AC 40-400V 100A Digital Voltage Ampere Panel Meter 220V 110V Ammeter Voltmeter
https://www.ebay.com/itm/402895802827
https://www.ebay.com/usr/technicalaim
AC 40-400V 100A Digital Voltage Current Power Factor Meter Voltmeter Amperemeter
https://www.ebay.com/itm/233975732084
https://www.ebay.com/usr/elezone17
Now that first one is interesting to mount. The bezel has the wings that need pinching, but first you need to take the circuit board out, unless your hole is very sloppy. The important bit here, is that the guts come out easily.
These dual meters also come as single meters. Just volts, or just amps. They need a supply of about 3v to work, and by 12v they are bright. They can't use the 100v or so that they measure to power themselves though. You would need a separate supply for the circuits, to the voltage actually being measured, if you exceed 12v. The amp versions come with little external shunts on the larger sizes. This might be better if you need to use a lot of the 'full scale deflection' on an internal shunt model 🙂
Having two modules might give you 16mm high digits. I have a volt one in use and see it across the room. That would be a quicker fix than swapping out the display for a bigger one. Just get them side by side with a textured window, and you wouldn't know it was two screens.
These dual meters also come as single meters. Just volts, or just amps. They need a supply of about 3v to work, and by 12v they are bright. They can't use the 100v or so that they measure to power themselves though. You would need a separate supply for the circuits, to the voltage actually being measured, if you exceed 12v. The amp versions come with little external shunts on the larger sizes. This might be better if you need to use a lot of the 'full scale deflection' on an internal shunt model 🙂
Having two modules might give you 16mm high digits. I have a volt one in use and see it across the room. That would be a quicker fix than swapping out the display for a bigger one. Just get them side by side with a textured window, and you wouldn't know it was two screens.