MQ7-CO Sensor detection using that carbon monoxide alarm circuit PIC16F88 microcontroller based on the operating voltage 12v dc carbon monoxide detection whether by level in circuit 12v relay attracts the relay is connected to whatever (sounder, lamp, etc. ..)... Electronics Projects, MQ-7 Carbon Monoxide Alarm Circuit PIC16F88 "microchip projects, microcontroller projects, pic assembly example, pic16f88 projects, " Date 2019/08/02