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Results tagged with relay
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user 187471
A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.
1
vote
Need circuit modification for using a PC814 opto coupler to invert relay operation
This post might help: Activate 12 V Relay with a 5 V GPIO
Good luck and cheers. …
- 2,956
1
vote
How to wire a Rpi, a relay, a DPDT and a PWM module to a DC motor, allowing to control its d...
In other works, the first stage 5V relay switching on/off 12V motor power supply might not be necessary.
Answer
Well, there are many causes frying the Rpi's. …
- 2,956
1
vote
Accepted
How to trigger a Low-level relay with PIR sensor?
It is a Low level relay
(1) The relay module seems to have only one transistor, and that it all. … - tlfong01, EESE, 2020jun13
Appendices
Appendix A - Confusion of Relay and Relay Module
Newbies always mixed up relay and relay module. A relay is the small rectangular blue box. …
- 2,956
1
vote
220VAC to 12VDC Capacitive Dropper Power Supply Driving Relay Problem
Answer
Update 2020oct13hkt0914
The OP seems using a relay switch without any flyback diode. The back EMF from the inductive coil of the relay switch might cause big trouble. … Power Supplies: Resistive and Capacitive (with Vout and power calculations) - Reston Condit, MicroChip, App Note AN954, 2004
Appendices
Appendix A - Capacitive Dropper - Wikipedia
Appendix B - Songle Relay …
- 2,956
2
votes
How can I increase the output current to make it sufficient for relay module?
Answer
(1) The OP's relay is opto-isolated, Low level triggered, JD-Vcc jumpered.
(2) To trigger the relay, a Low level signal is used to sink around 5mA to GPIO pin.
(3) The GPIO pin should be able to … References
(1) How to properly use a relay module with JD-VCC from Arduino/Raspberry? - SE EE 2020jun13 …
- 2,956
0
votes
How to wire this relay with a H/L (High/Low) jumper to Raspberry Pi?
Answer
(1) The OP's relay has a H/L jumper to select the relay to be High trigger or Low trigger.
(2) If the H/L jumper is set to "H", then the relay becomes High level trigger. … References
(1) How to properly use a relay module with JD-VCC from Arduino/Raspberry?
Notes
(a) Part D explains High/Low level selectable relay using H/L jumper. …
- 2,956
2
votes
Activate 12 V Relay with a 5 V GPIO
The KY019 relay uses a Songle 5V relay switch, with nominal current of 90mA (measured 70mA). GPIO High is 3V3. … Relay Datasheet Summary
Appendix B - Relay switching I-V Summary
Appendix C - KY019 Relay Circuit Design Parameters …
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1
vote
Clarification on relay withstand voltage
I can try to answer the first part of your question:
(1) COM1 and NO1 can withstand a voltage of 1,000V between the two contacts. As you said, the connection/wiring are via PCB routes/copper traces.
( …
- 2,956
33
votes
Accepted
How to properly use a relay module with JD-VCC from Arduino/Raspberry?
Another confusion is between the "relay switch" and the "relay module". The little blue cube is the relay switch, usually marked "Songle" or other brands like TongLing or WV. … The schematic of the H/L select jumper relay is shown below. This relay lets the user select the relay as High level or Low level trigger. …
- 2,956
3
votes
Driving 5V powered relay module from 3V3 powered microcontroller
Actually Rpi has the same problem with a couple of other Arduino only devices, including 5V low level trigger relay. Similarly Rpi can only switch on, but not switch off. … Another get around it is the following:
To switch off relay, instead of set GPIO High,
set GPIO to input mode
/ to continue, ... …
- 2,956
-2
votes
Why can't I trigger my relay?
Datasheet - Songle
(5) How to use a JD-Vcc Relay? … Let us start with 2N3904, which is used to drive the Songle relay switch. …
- 2,956
3
votes
Can I use a ULN2003A IC as many transistor switches?
Your ULN2003 choice is good, because it can handle max 150mA, and the most popular, typical 5V relay switch, Songle relay switch, takes only max 70mA. …
- 2,956