The display module of the multi-channel drive adopts the scanning method, and there are voltages in the pen segments that are not displayed. The small appliance control panel manufacturer reminds you that under normal circumstances, when the voltage is far from the threshold voltage of the liquid crystal, the pen segment does not appear to appear. However, if the operating voltage of the module rises above the normal operating voltage, and the voltage is close to the threshold voltage of the liquid crystal, the pen segment will appear looming. The connection line should not be too long, and the control panel of small appliances is generally controlled within 500px. Adjust the potentiometer to adjust V0 to the appropriate voltage until the LCD has a slightly darker shadow. There may be a short circuit, a broken circuit, a cross circuit or a virtual soldering, etc., you must use a multimeter to check that each pin is connected to the microcontroller (set with the program), and there is no short circuit between the two adjacent pins.



Because the default form of the character display module is 16X1 when it is powered on, a row of black blocks will appear when it is powered on. The main program of the small appliance control panel manufacturer initializes it, and after successfully setting the display form to 16X2, the black block will disappear naturally. The MCU first outputs the control signal to trigger the ignition control circuit and the flame detection reaction circuit. The flame is detected by the flame detection reaction circuit and the detection result is reflected to the MCU. The MCU can control the opening and closing of the solenoid valve according to the input flame detection signal, thereby ensuring When the gas stove is in the state of accidental flameout and flashback, the control system of the control panel of the small household appliances can close the solenoid valve in time, shut off the gas passage, and avoid the safety accident caused by the flameout.