i attempted to measure voltage at a point by opening and closing a switch with interrupt in arduino uno board. i need to measure the voltage after 100 ms from the instant of opening of the switch and to measure the voltage after 100 ms of the closing of the switch.
The interrupt exactly interrupt at every 4 seconds to open the switch but the problem is the opening time interval of the switch varies for every cycle. 20ms, 50ms etc.,. i attached the code. please help me to rectify the problem.
If you are using mechanical relays as switches, I think there is no solution. Mechanical relay timings are random in milliseconds, so I don't think you can control it.
If you want precise measurements, try using Solid State Relays.
https://en.wikipedia.org/wiki/Solid-state_relay
Dear Vishnu, i have added a diagram to explain my problem more detail. my problem is with execution of the program. please reply
The problem is in:
Loop and interruput have different (not sync) inputs - Floop*20 != Finterrupt . You observe low speed variations Fdif = Floop*20 - Finterrupt
To solve the problem You needs single source of sync.
For example:
a) set interrupts with 100000us=100ms and count them to switch pin high/low
or
b) count loops to switch high/low every 20-th
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