Hello all!
Searching did not yield any results I was looking for, but I'm trying to figure out a latching relay or switch triggered by a button or HBHF sensor, but also able to override and switch off manually if need be.
Say.... someone walks into the room to activate a HBHF sensor, it turns on a light, but that light will then stay on until manual intervention even after the person is out of range of the sensor. I was thinking memory cell into the toggle of a switch, but once power is removed from the switch the circuit opens. The other odd thing is that the switch then won't work at all manually, I will have to remove the power into the switch, then add it back to "reactivate" the switch, if that makes sense.
Thanks all!
I'm trying to set up a control panel to switch on/off a remote air compressor. The Motor is 15A@230V
I'd like to be able to control it with a push momentary button to turn it on, but a 2nd momentary button to turn it off (i'm setting up several "STOP" buttons around the shop, for my machinery.
I cannot find a 15A relay.Here is my question, can I wire two 10A relays in parallel?
If the question is no, then is there a good place to find these? I checked Digikey, Mcmaster, and Granger. None of them had what I wanted.
I do not really want a Sequenced relay. a lot of "latching" relays on amazon and other places are actually sequenced or bistable relays.
I just wanted to double check. I have purchased a non latching relay. I selected the 240v one as I'm in the UK.
https://uk.rs-online.com/web/p/non-latching-relays/1218073
I'll be using a retractive (momentary) switch to send power to it.
Once the relay activates it would allow 12v DC to flow through the other contacts through to a control board.
The control board is for a motorised door opener.
What i want to check is that the relay will not allow AC voltage to reach the otherside and possibly damage the board. Or if there's anything else I need to add for protection.
The power comes through a lighting circuit (protected at 5amps)
I have tested the switch and relay but not yet connected it to the control board.
I am looking for a 12v 10-15A latching relay that switches on on application of momentary trigger and reverts to off stage when power is lost.
Something similar to this, but does not retain the on state on power loss.
DPST 1NO 1NC 8Amp Latching Relay Module (DC 12V) OONO https://www.amazon.com/dp/B08R7G11XC/ref=cm_sw_r_tw_dp_FJYTG34JBYZ79V2JGP1X
I need to control a latching relay - this relay will enable/disable depending on the polarity of the power, so I'm using a simple H-bridge (low power, this isn't a motor going at many amps). The MCU basically will use control1/control2 to set the direction of the latch, and both goes low when there's no movement of the relay. Simple - but I have a question.
Typical when driving a motor we place a Zener around each transistor. I'm not using Mosfets so no diode is built in. Given I'm just driving a small relay solenoid with a single pulse, I'm fairly sure I don't need one, but I wondered if anyone here could argue why I would need them?
https://preview.redd.it/jhooi7dub9j61.png?width=669&format=png&auto=webp&s=70e9d900a75d9e952e7ab2a376dbf0074dde1c5a
I am looking for a simple wireless relay to start my generator from inside. It is a single wire start meaning I just have to supply power to the ECM and it will control the rest. So ebay is filled with these wireless relays with the cheapest key fob that would work. But I want to find a transmitter that just gives me some contact points that I can wire to any two button for on and off. Of even possibly anther controller to auto start the generator. It can not be WIFI since it needs to work with no power. (Besides Internal Batteries)
Maybe some kind of wireless I/O? Two way would be great so I can send some data back like fuel level, Coolant Temp, etc.
Hey, I'm a noob at electronic engineering so please bear with. This is for a personal project to create a smart thermostat so besides a year at school doing electronics a long while back, I'm pretty new to all this stuff.
I'm trying to design a latching relay board, the objective is to have a 3.3-5v set & reset line come from an external microcontroller that will trigger a latching relay to the appropriate position. (It's important that it's a latching relay in this case as the whole thing will be battery powered and the power consumption of an active relay is just too high)
I've broken the circuit down into 4 parts;
1 - Isolation of the 2 input signals using optocouplers
2 - Logic to ensure only set OR reset are being passed in. (It's advised in the latch datasheet that only one coil is energized at a given time - and I wouldn't want it to be in an ambiguous state)
3 - Converting the input into a fixed-length pulse that'll be long enough to change the relay state without wasting power
4 - Amplifying the pulse to a high enough current/voltage needed by the coil (The coil needs 5V/80mA - 400mW for at least 30ms if I've read the datasheet correctly)
I think I've got the circuit mostly there, but I'm confused by a few things;
In the simulator I'm using (falstad), the optocouplers seem to be behaving in the opposite manner to what I would expect, is the output meant to be high when the input is high or have I gotten this wrong?
My 555 timing circuit also doesn't seem to be working when I drop the input to low, I would expect it to trigger a ~200ms burst with my current RC values, but that doesn't seem to be happening.
Can a transistor be driven straight off of a logic gate? I need something that can sink the high current needed to energize the coil.
And finally, the latching relay I've chosen (HF115F-L/5-H3L2TF), can anybody make sense of the 2 coil form A reset/set wiring? I can't tell which input would need to be high/low for each state.
Latching relay datasheet (2 pole version): https://docs.rs-online.com/90b5/0900766b81663cbb.pdf
Circuit: https://imgur.com/a/BdMUZuN
Thanks!
I have a custom built arcade cabinet that uses a PC inside but I'm buying another MiSTer (my third!!) to place inside of it.
At the top of the cabinet I have a simple momentary arcade button that was connected to the PC motheboard on/off pins.
How can I do something similar to turn on the MiSTer?
I THINK I need something like this:
[Momentary Arcade Button] -> [Momentary -> Latching Switch] -> [Relay] -> MiSTer Power (Mean Well PSU) -> MiSTer
Does that sound right? Has anybody done this?
EDIT: As I'm thinking about this, I wonder if using a Tasmota Basic switch might make more sense since it's probably much easier and I think I can wire the arcade button to the GPIO pins to work as on/off button?
Soft click switches are a bit pricey and I have some momentary footswitches on hand...Would also prefer to have an led much like the millennium bypass circuit.
A big hello to all the lovely people on here!
I'm new to home automation in general, I have a solar system installed, I get inverter data through MQTT. I'm going to deploy Home Assistant to monitor the relevant inverter value I'm going to use to decide to flick the SATS switch.
What I want to do is use ESPHome on a ESP32-POE to activate a latching relay which is turn activates a Latronics SATS solar transfer switch (the transfer "trigger" is to connect terminals 6 and 2 on the SATS together).
Activating the SATS will switch my solar from my off-grid to my grid-tied inverter when my batteries are charged and I have excess solar, so the SATS will be activated for hours at a time. When the sun goes down I want to switch back to off-grid inverter so I'm charging the batteries when the sun comes up.
This is from the SEEED page:
The relay hold in "set" status(Comm and NO connected) in default, when there is a rising edge on the SIG pin. It turns the "reset" state(Comm and NC connected). The reference code is shown below:
#define LatchingRelay 3
void setup()
{
pinMode(LatchingRelay,OUTPUT);
digitalWrite(LatchingRelay,LOW);
delay(1000);
digitalWrite(LatchingRelay,HIGH);
delay(1000);
}
void loop()
{
}
The relay hold in "reset" status(Comm and NC Connected), when there is a falling edge on the SIG pin. It turns the "set" state(Comm and NO connected). The reference code is shown below:
#define LatchingRelay 3
void setup()
{
pinMode(LatchingRelay,OUTPUT);
digitalWrite(3,HIGH);
delay(1000);
digitalWrite(3,LOW);
delay(1000);
}
void loop()
{
}
The question is can I replicate this behaviour in ESPHome?
Thanks.
Richard
