Clearly the tutorials are not posted by, or reviewed by, qualified experts. It is also most important to connect a flyback diode across the motor terminals, otherwise when the motor does switch off, the Arduino, and even your laptop could be damaged.ĭon't use tutorials from that site again, and advise your friends and classmates about it. This is the opposite way to the relay board shown in the tutorial.Īs says, you should not run the pump off the Arduino's 5V supply, you should avoid running high currents through the breadboard, and use heavier gauge wire to carry the motor current. Maybe your pump is running because it is connected to the COM and NC terminals? EDIT: your relay board has opto-isolators, so a LOW signal will switch on the relay and a HIGH signal will switch it off. You seem to have the relay powered by 3.3V but it is a 5V relay. My theory is that the relay is not switching properly. Standard interface that can be controlled directly by. With a relay coil to absorb the diode protection. With a power indicator, an 8-way road has a status indicator. Can be selected by jumper relay and TTL or ground. What does the multimeter show when the sensor is above and below 400? Fritzing is installed with a Parts Library-and with every new release we are adding new parts. 5V Relay interface board, each one needs 70mA Driver Current Equipped with high-current relay, AC250V 10A DC30V 10A Each relay has normally open and normally closed contact. Set the multimeter to resistance or continuity range. Disconnect the pump and connect your multimeter to the same terminals.
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