![]() digitalWrite(relay, HIGH) Control Multiple Relays with ESP32 Web Server If you’re using a normally closed configuration, send a LOW signal to stop the current flow. Stop the current flow by sending a HIGH signal to the relay pin. If you’re using a normally closed configuration, send a HIGH signal to light up the lamp. In the loop(), send a LOW signal to let the current flow and light up the lamp. In the setup(), define the relay as an output. (if you're usong Normally Closed configuration send LOW signal)ĭefine the pin the relay IN pin is connected to. Normally Open configuration, send HIGH signal stop current flow (if you're usong Normally Closed configuration send HIGH signal) Normally Open configuration, send LOW signal to let current flow The above copyright notice and this permission notice shall be included in allĬopies or substantial portions of the Software. The following code will light up your lamp for 10 seconds and turn it off for another 10 seconds. While programming the ESP or wiring your circuit make sure everything is disconnected from mains voltage.Īlternatively, you can use a 12V power source to control 12V appliances. If you’re not familiar with mains voltage ask someone who is to help you out. Warning: in this example, we’re dealing with mains voltage. The diagram shows wiring for a 2-channel relay module, wiring a different number of channels is similar. Wiring a Relay Module to the ESP32Ĭonnect the relay module to the ESP32 as shown in the following diagram. That configuration physically isolates the relays from the ESP32 with the module’s built-in optocoupler, which prevents damage to the ESP32 in case of electrical spikes. Without the jumper cap, you need to provide an independent power source to power up the relay’s electromagnet through the JD-VCC pin. That means the relay electromagnet is directly powered from the ESP32 power pin, so the relay module and the ESP32 circuits are not physically isolated from each other. With the jumper cap on, the VCC and JD-VCC pins are connected. Notice that the module has a jumper cap connecting the VCC and JD-VCC pins the one shown here is yellow, but yours may be a different color. The JD-VCC pin powers the electromagnet of the relay. The second set of pins consists of GND, VCC, and JD-VCC pins. Use a normally open configuration when you want the current to flow occasionally (for example, turn on a lamp occasionally). You should use a normally closed configuration when the current should be flowing most of the times, and you only want to stop it occasionally. This means that you’ll have the following scenarios: The relay is triggered when the input goes below about 2V. The signal you send to the IN pins, determines whether the relay is active or not. If you have four channels, you’ll have four IN pins, and so on. If your relay module only has one channel, you’ll have just one IN pin. The first set consists of VCC and GND to power up the module, and input 1 ( IN1) and input 2 ( IN2) to control the bottom and top relays, respectively. You have use shift registers to control more relays if Arduino doesn't have enough pins for your setup.The low-voltage side has a set of four pins and a set of three pins. The amount of relays you control is not restricted to the amount of Arduino pins. Relay boards are available with 1, 2, 4, 8 and even 16 relays. ![]() You can modify the code on whatever amount of relays your controller can bare. ![]() My board has 2 relays, but in this example I am going to use just 1 relay. In this example I am trying to switch a lamp or if to be more exact a household socket that runs on 230V and you can put any item you have in your home to work on it. The board relay says it is up to 10A, but I wouldn't use that much on it. I live in Europe so my household electricity runs on 230V which fits nicely in the 250V limit. ![]() This is a general board 5v relay that can control 250V AC, 125V AC, 30V DC or 28V DC. This is very general relay board, you can find it in ebay, amazon and even in some local stores. 5V 2-Channel Relay Module Shield For Arduino with Free ShippingThis guide shows how to control 220 / 230 V using relay board.
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