How do you increase the sensitivity of the re200b? we've now got a working circuit but its two problems are:

- the sensitivity of the pir sensor
- the length of time the light is on, max is 15 secs. we want to reach about 4 mins.
- the power supply is 3v! the circuit is designed to run at 5v. is this connected to the sensitivity problem?
- we want it so that we can plug it directly to 220V. we are trying transformerless power supply but the current is unstable.

 

we are trying transformerless power supply but the current is unstable

Transformerless supplies are just lethal shock hazards waiting to happen. You must use a transformer to make the circuit safe to use.