Create relay free potential free switch.
-
Hi there,
i need some help with an idea i need...
I looking far a way to control a potential free contact to control an water lock, but without using a relay. if my water lock sees 10K on its connection it keeps it closed so no watering, if it sees 0 ohm it will have permission to water. my plants
.
i was thinking to use an opto coupler but those i now need a voltage going tru on the output... or am i wrong.or maybe some kind of hal sensor with internal coil controlled by an arduino
-
@Rene046 said in Create relay free potential free switch.:
battery powered project....
Why not just use a latching relay ?
-
Ok i explain.
i have and Gardena Watering computer, here i want to connect a controller on battery to
All this controller has to do via Mysensors is open or close a an switch (the 2 wires of this switch go inside the gardena computer that is looking for an 10k resistance to stop watering the plants, and an open switch 0 ohm to water the plants.Some distance further i have an other node that's measuring soil moisture,
I have this now running by using normal relays, but using 2 of them (2 garden computers ) they use allot of battery power while watering so i was hoping there are some more better options.
-
And there are also some latching relays with 2 latches, one to switch on, one to switch off.
You can just switch off at the beginning of your sketch.
It's even possible to do that with hardware, to send a pulse to the "switch off" latch when the system is started. So even if your sketch fails to start, your relay will be off. -
will give it a try.
this is the sketch i want to implement this in:
It will be a repeater node,
I would like to have 2 Relays on pins D3,D4
And a temperature sensor on D5 (DS1820)
Eventually an voltage sense pin A3/* * Documentation: http://www.mysensors.org * Support Forum: http://forum.mysensors.org * * http://www.mysensors.org/build/relay */ // Enable debug prints to serial monitor #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 #define MY_RF24_PA_LEVEL RF24_PA_MAX // Enabled repeater feature for this node #define MY_REPEATER_FEATURE #define MY_NODE_ID 1 #include <SPI.h> #include <MySensors.h> #include <Bounce2.h> #include <SPI.h> #include <DallasTemperature.h> #include <OneWire.h> #define COMPARE_TEMP 1 // Send temperature only if changed? 1 = Yes 0 = No #define RELAY_PIN1 3 // Arduino Digital I/O pin number for relay #define BUTTON_PIN 7 // dont need this one remove #define CHILD_ID 1 #define RELAY_ON 1 #define RELAY_OFF 0 Bounce debouncer = Bounce(); bool state = false; bool initialValueSent = false; MyMessage msg(CHILD_ID, V_STATUS); void setup() { // Setup the button //pinMode(BUTTON_PIN, INPUT_PULLUP); // After setting up the button, setup debouncer //debouncer.attach(BUTTON_PIN); //debouncer.interval(10); // Make sure relays are off when starting up digitalWrite(RELAY_PIN1, RELAY_OFF); // Then set relay pins in output mode pinMode(RELAY_PIN1, OUTPUT); // Set relay to last known state (using eeprom storage) state = loadState(CHILD_ID); digitalWrite(RELAY_PIN1, state?RELAY_ON:RELAY_OFF); } void presentation() { // Startup initialize MySensors library. Set callback for incoming messages. sendSketchInfo("Lamp", "1.0"); present(CHILD_ID, S_BINARY); } void loop() { if (!initialValueSent) { Serial.println("Sending initial value"); send(msg.set(state?RELAY_ON:RELAY_OFF)); Serial.println("Requesting initial value from controller"); request(CHILD_ID, V_STATUS); wait(2000, C_SET, V_STATUS); } if (debouncer.update()) { if (debouncer.read()==LOW) { state = !state; send(msg.set(state?RELAY_ON:RELAY_OFF), true); // Send new state and request ack back } } } void receive(const MyMessage &message) { if (message.isAck()) { Serial.println("This is an ack from gateway"); } if (message.type == V_STATUS) { if (!initialValueSent) { Serial.println("Receiving initial value from controller"); initialValueSent = true; } // Change relay state state = (bool)message.getInt(); digitalWrite(RELAY_PIN1, state?RELAY_ON:RELAY_OFF); send(msg.set(state?RELAY_ON:RELAY_OFF)); // Store state in eeprom saveState(CHILD_ID, state); // Write some debug info Serial.print("Incoming change for sensor:"); Serial.print(message.sensor); Serial.print(", New status: "); Serial.println(message.getInt()); } }``` -
So far 1 relay works perfect adding a second one will be a bid harder because the sketch samples i found use more than 2 i would like to know how to add just a second one.
also in this sketch in need to find out hoe to remove the button function.
Adding the temperature sensor seems for me very hard, because i would like to call it every 5 minutes without interrupting the repeater. (No Sleep can be used).
if i know how to call every 5 minutes the temperature, i think i'll be able to add the also the adc code.I someone could point me to some code sample i would be very happy...
