AC dimmer controls the voltage of alternating current (AC) to adjust the brightness of lights or the speed of motors. Normally it use phase-cut dimming to control the amount of power delivered to a load. They are often used in homes and businesses to conserve energy and to control the lighting environment.

MaTouch 1.28” ToolSets are series of ESP32-based products mainly consist of MaTouch 1.28” controller and kinds of functional expansion such as Dimmer/ Relay Controller/ Motor Driver, etc. It’s designed as tools to control/drive these actuators directly while also keep open hardware/software, which make it possible for users’ remaking and integration to other field projects.

• ESP32S3 16MB Flash, 8MB PSRAM / 1.28” 240*240 display /Capacitive Touch;
• UI designed by LVGL/ Sqareline;
• Arduino V2.3.4 compatible Source Code
• Hardware/Software Open Source;

This MaTouch 1.28” ToolSets_AC Dimmer chopper circuit based on Triac BT139, and zero-cross detection circuit, it detects the zero-cross points and then the Triac controlled to chop the AC. Besides, to avoid the problem of AC can not be totally shunted off with Triac, a relay is implemented to make the AC totally On/Off. On-board AC/DC module implemented, so no external power supply needed, suitable for field applications.

This MaTouch 1.28” ToolSets_AC Dimmer Features:

• Input Voltage: AC100 to AC240V,50HZ~60Hz
• Output: AC100 to AC240V，0%~100%
• Max Load:10A 240VAC
• On board AC-DC Module: DC5V@0.6A
• Operation Temperature:-20℃ to +70℃

Please note: If using with high voltages (> 24V) use care and common sense! High voltages require experience, and are only for use by engineers who are comfortable with guidelines and know how to use them safely!