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Question:

3V relay control another 3V relay problem, may I ask this to work properly, thank you

I now have a DC3V relay (relay B), relay contactors are wiring package, and can not be changed, want to use single-chip control, but no isolation and amplification, found in this module This is a module on Taobao (module A) 1. Module A Product Features: 1.1 relay voltage: DC 3V / 3.3V 1.2 can control 10A 250VAC, 10A 30VDC load 2. Single-chip I / O port: voltage 3.3V, current maximum 25mA Now to the module A power input power supply 3.3V, the signal input for the microcontroller I / O port The output of module A is normally connected to the positive pole of the coil of the motor B, and the negative terminal of the common terminal B I would like to ask: Can the I / O port of the microcontroller drive this relay module? Is the output of module A connected to relay B to enable relay B to work properly,

Answer:

1 single-chip I / O port can control the "module A" work; 2 "module A" must work to connect their own power, that must be connected to the right side of the power input, only connected to the microcontroller output can not directly "module A" work; 3 "module A" output corresponds to the three contacts of a switch. When the "module A" relay is released, the output common terminal is connected with the normally closed end branch. When the "module A" relay is engaged, the common terminal and the normally open end There is no voltage or current output for the three terminals. Therefore, when a relay or lamp is connected between the common terminal and any other terminal, the relay of the module A Or light bulbs because there is no power drive, will not work; 4 relay B must be its own power supply, because the output of module A can control the AC 250V or below DC 30V or less, the current below 10A load, so the relay B can use AC 220V or DC 30V relay, for example, relay B Using a DC 24V relay, the positive terminal of the 24V DC power supply is connected to the common output of module A, and one of normally open or normally closed terminals is connected to one end of the relay B coil (the terminal of the relay control coil is generally not positive and negative) The other end connected to the 24V power supply negative, so that the module A in the microcontroller under the control of the relay pull or release, making the output switch state transition, the relay B can be controlled in accordance with the microcontroller is turned on or off, that is normal work.
May 9, 2017
If the purpose of using relay B is to control the 220V contactor through it again, it is the use of relay B contact switch to control the contactor work; as described, do not need to use relay B, because the module A The output (ie, switch) performance has been fully met to control the 220V AC contactor control requirements.
May 9, 2017
According to you, is to use relay A control relay B power supply? Then connected to the B power supply Well, that is possible. But if only 3V, then think there is no need to add a A, and you use a N-channel MOS tube control power is not on the line Mody
May 9, 2017

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