Power Supply Voltage
1471 Views - Created 25/09/2018
I am using a pressure sensor where the spec sheet shows Supply Voltage of 5V+-.25V.
I have two sensors that have quit working. Today when I check the voltage on the supply pins of the ADC my fluke meter shows 5.13V.
Is the ADC just passing through power from the PiZero and do you think the voltage is stable and within range of the presure sensor?
Basic switch-mode supplies like those often supplied with Raspberry Pi kits may fluctuate by a few millivolts when the CPU on the Raspberry Pi is under heavy loads so it is best to monitor the 5V pin with a multimeter to see if the voltage does change when you are using the Raspberry Pi.
If your sensor needs a very stable supply voltage then it may be worth using a separate power supply for the sensors. As long as the ground pins for the sensor power supply and the Raspberry Pi power supply are connected together the ADC Pi should be able to read the voltages coming from a separate power supply without any issue.
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