I'm using the attached circuit for getting the galvanic skin resistance. The bridge circuit is working fine and I'm able to obtain resistance output as required (points Out_1 and Out_2 - varying between 0.8M - 1.5M ohm) but the op-amp circuit is not functioning. I'm not getting the required voltage levels (not shows any voltage levels at all at pin 14 of IC) which I then need to interface to ATmega16 microcontroller by internal ADC of uC to get this reading on LCD. Is something wrong with the circuit. Some help would be really appreciated guys. I'm stuck.
Values for various components are:
R1 = R2 = R3 = 1M ohm
R4 = R5 = R6 = R7 = 1K ohm
IC used is LM324