Embedded Files
After running a Raspberry Pi based sprinkler from my workshop, I got a little worried about all the dirt, grime and sawdust covering my Pi and clogging the cooling fan. I decided to split the functions between an Arduino Uno and a Raspberry Pi running Node Red and MQTT. The Arduino is running in the hostile environment of the workshop and the Pi runs in my air conditioned Ham Shack on a UPS.
I consider the Arduino a stupid device that only listens for commands from the Pi and responds by turning water valves on and off. When a command is received, an acknowledgement is sent back to the Pi. When a command is received to turn on a valve, a timeout timer starts that will cause the valves to be turned off if a turn off command is not received in a reasonable time period. I run my sprinkler a maximum of 15 minutes at a time and the timeout will reset the sprinkler after 21 minutes. I do this in case communications is lost between a turn on and turn off command. Other than the timeout timer, the Arduino makes no decisions on its own.
The Arduino has an Ethernet shield and an interface to a relay module. Here is the code running on the Arduino. Change the code to match yout network requirements and desired I/O pins connected to the relay board.
Click here to see the Arduino sketch: ↓ ↓ ↓ ↓ ↓
Click here to see the Arduino sketch: ↓ ↓ ↓ ↓ ↓
#include <Ethernet.h>
#include <MQTT.h>
#include <Wire.h>
//#include "Adafruit_MCP9808.h"
int masterPin = 8;
int zone1Pin = 7;
int zone2Pin = 4;
byte mac[] = {0x00, 0x50, 0x56, 0xFE, 0x09, 0x97};
byte ip[] = {192, 168, 254, 97}; // <- change to match your network
//Adafruit_MCP9808 tempsensor = Adafruit_MCP9808();
//String temp_str;
//char temp[50];
EthernetClient net;
MQTTClient client;
unsigned long startMillis;
unsigned long currentMillis;
const unsigned long timeout = 1260000; // 21 minutes
char timerstarted = '0';
void connect() {
//Serial.print("connecting...");
while (!client.connect("arduino", "try", "try")) {
//Serial.print(".");
delay(1000);
}
//Serial.println("\nconnected!");
client.subscribe("garden/#");
// client.unsubscribe("/hello");
}
void messageReceived(String &topic, String &payload) {
// Serial.println("incoming: " + topic + " - " + payload);
if (topic == "garden/valve/master") {
Serial.println("incoming: " + topic + " - " + payload);
if (payload == "1") {
timerstarted = '1';
startMillis = millis(); // start timeout counter
digitalWrite(masterPin, LOW);
client.publish("gardenuino/masterack", "1");
} else {
timerstarted = '0';
digitalWrite(masterPin, HIGH);
client.publish("gardenuino/masterack", "0");
}
}
if (topic == "garden/valve/zone1") {
Serial.println("incoming: " + topic + " - " + payload);
if (payload == "1") {
digitalWrite(zone1Pin, LOW);
client.publish("gardenuino/zone1ack", "1");
} else { digitalWrite(zone1Pin, HIGH);
client.publish("gardenuino/zone1ack", "0");
}
}
if (topic == "garden/valve/zone2") {
Serial.println("incoming: " + topic + " - " + payload);
if (payload == "1") {
digitalWrite(zone2Pin, LOW);
client.publish("gardenuino/zone2ack", "1");
} else { digitalWrite(zone2Pin, HIGH);
client.publish("gardenuino/zone2ack", "0");
}
}
if (topic == "garden/alive") {
client.publish("gardenuino/alive", "1");
// tempsensor.wake(); // wake up, ready to read!
// float f = tempsensor.readTempF();
// temp_str = String(f);
// temp_str.toCharArray(temp, temp_str.length() - 1);
// delay(2000);
// tempsensor.shutdown_wake(1);
// client.publish("garden/temperature", temp);
}
}
void setup() {
pinMode(masterPin, OUTPUT);
pinMode(zone1Pin, OUTPUT);
pinMode(zone2Pin, OUTPUT);
digitalWrite(masterPin, HIGH);
digitalWrite(zone1Pin, HIGH);
digitalWrite(zone2Pin, HIGH);
Serial.begin(115200);
Ethernet.begin(mac, ip);
client.begin("192.168.254.101", net);
client.onMessage(messageReceived);
connect();
Serial.println("I am here");
//if (!tempsensor.begin(0x18)) {
// Serial.println("Couldn't find MCP9808! Check your connections and verify the address is correct.");
// while (1);
// }
// Serial.println("Found MCP9808!");
// tempsensor.setResolution(3); // sets the resolution mode of reading, the modes are defined in the table bellow:
}
void loop() {
if (timerstarted == '1')
{
currentMillis = millis(); //get the current "time" (actually the number of milliseconds since the program started)
if (currentMillis - startMillis >= timeout) //test whether the period has elapsed
{
// turn off all the valves
digitalWrite(masterPin, HIGH);
digitalWrite(zone1Pin, HIGH);
digitalWrite(zone2Pin, HIGH);
Serial.println("\ntimed out!");
timerstarted = '0';
client.publish("gardenuino/valvetimeout", "1");
}
}
client.loop();
if (!client.connected()) {
connect();
}
}
// Forgive me for not cleaning up the indentation in the code. It works for me, that's all I'll say.
Click here to see the Node Red flow : ↓ ↓ ↓ ↓ ↓
Click here to see the Node Red flow : ↓ ↓ ↓ ↓ ↓
(Can be imported into Node Red)
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Disable","info":"","x":100,"y":20,"wires":[]},{"id":"84395796.014f58","type":"function","z":"5a966310.e46a0c","name":"String to Num","func":"if (msg.payload == \"1\") { \n msg1 = { payload:1 };\n } else {\n msg1 = { payload:0 };\n }\nreturn [msg1];","outputs":1,"noerr":0,"x":320,"y":160,"wires":[["d6f7b0a9.35984","10855c88.1a9fe3"]]},{"id":"cd7c326a.901c","type":"function","z":"5a966310.e46a0c","name":"Toggle \"Disable\"","func":"var msg1 = flow.get(\"disabled\")|| \"\";\nif (msg1 == 1){\n flow.set(\"disabled\",0);\n msg1 = { payload:0};\n}else{\n flow.set(\"disabled\",1);\n msg1 = { payload:1};\n}\nreturn [msg1];","outputs":1,"noerr":0,"x":320,"y":60,"wires":[["fe49c899.486cf8"]]},{"id":"4f0d8416.bbcfec","type":"ui_button","z":"5a966310.e46a0c","name":"","group":"863689d4.9f3c88","order":2,"width":"2","height":"2","passthru":false,"label":"","tooltip":"","color":"red","bgcolor":"#333333","icon":"power_settings_new","payload":"1","payloadType":"num","topic":"","x":90,"y":60,"wires":[["cd7c326a.901c"]]},{"id":"d6f7b0a9.35984","type":"ui_gauge","z":"5a966310.e46a0c","name":"Disabled","group":"863689d4.9f3c88","order":1,"width":"2","height":"2","gtype":"donut","title":"Disabled","label":"","format":"{{value}}","min":0,"max":"1","colors":["#00b500","#e6e600","#ff0000"],"seg1":"","seg2":"","x":580,"y":160,"wires":[]},{"id":"437ffb3b.f97fb4","type":"comment","z":"5a966310.e46a0c","name":"Timers","info":"","x":70,"y":260,"wires":[]},{"id":"6690d2b0.10768c","type":"function","z":"5a966310.e46a0c","name":"Rainy Day?","func":"var wet = msg.payload[\"weather\"];\nwet = wet.toLowerCase();\n\nif (wet == \"rain\"){\n msg.payload = 1;\n flow.set(\"raining\",msg.payload);\n return msg;\n}","outputs":1,"noerr":0,"x":610,"y":720,"wires":[["3dd7e19b.5e7ebe"]]},{"id":"3dd7e19b.5e7ebe","type":"mqtt out","z":"5a966310.e46a0c","name":"garden/rain","topic":"garden/rain","qos":"2","retain":"true","broker":"e0ba888b.b9d328","x":830,"y":720,"wires":[]},{"id":"5cd82c0f.e18cf4","type":"inject","z":"5a966310.e46a0c","name":"Query Every 10 Minutes","topic":"","payload":"1","payloadType":"num","repeat":"600","crontab":"","once":true,"onceDelay":"1","x":190,"y":720,"wires":[["33e4c091.a93d4"]]},{"id":"6f53601d.49e6d","type":"function","z":"5a966310.e46a0c","name":"Rainy Day Reset","func":"flow.set(\"raining\",0);\nreturn msg;","outputs":1,"noerr":0,"x":850,"y":760,"wires":[[]]},{"id":"f50de06c.6bfc1","type":"comment","z":"5a966310.e46a0c","name":"Rain Override","info":"","x":70,"y":700,"wires":[]},{"id":"53e05615.b41f38","type":"inject","z":"5a966310.e46a0c","name":"Reset Rain at 8:00PM","topic":"","payload":"0","payloadType":"num","repeat":"","crontab":"00 20 * * *","once":false,"onceDelay":0.1,"x":570,"y":800,"wires":[["3dd7e19b.5e7ebe","6f53601d.49e6d"]]},{"id":"bfc61232.98284","type":"ui_button","z":"5a966310.e46a0c","name":"Rain Reset","group":"928b09a9.067248","order":8,"width":"2","height":"2","passthru":false,"label":"Rain RST","tooltip":"","color":"","bgcolor":"#333333","icon":"cloud_off","payload":"0","payloadType":"num","topic":"","x":610,"y":760,"wires":[["6f53601d.49e6d","3dd7e19b.5e7ebe","4af678b1.144b98"]]},{"id":"c44c7e51.104c1","type":"ui_text","z":"5a966310.e46a0c","group":"6297bca7.d83e54","order":1,"width":"4","height":"2","name":"Garden Weather Text","label":"","format":"{{payload.weather}}<br/>Temp {{(payload.tempc * 9/5 + 32).toFixed(1)}}°F<br/>Humidity {{payload.humidity}}%<br/>Clouds {{payload.clouds}}%","layout":"col-center","x":640,"y":680,"wires":[]},{"id":"33e4c091.a93d4","type":"openweathermap","z":"5a966310.e46a0c","name":"Local Weather","wtype":"current","lon":"-83.44","lat":"34.11","city":"","country":"","language":"en","x":400,"y":720,"wires":[["6690d2b0.10768c","c44c7e51.104c1"]]},{"id":"ece957a9.1bc8e8","type":"function","z":"5a966310.e46a0c","name":"Overide","func":"var rain = flow.get(\"raining\")|| \"\";\nvar disable = flow.get(\"disabled\")|| \"\";\nif (rain === 1 || disable === 1){\n msg.payload = 0;\n}\nreturn msg;","outputs":1,"noerr":0,"x":300,"y":320,"wires":[["ecec1734.898728","3993d411.66003c"]]},{"id":"1c1955b4.2cc83a","type":"mqtt out","z":"5a966310.e46a0c","name":"","topic":"garden/valve/zone1","qos":"2","retain":"false","broker":"e0ba888b.b9d328","x":690,"y":280,"wires":[]},{"id":"3993d411.66003c","type":"mqtt out","z":"5a966310.e46a0c","name":"","topic":"garden/valve/master","qos":"","retain":"false","broker":"e0ba888b.b9d328","x":700,"y":360,"wires":[]},{"id":"ecec1734.898728","type":"delay","z":"5a966310.e46a0c","name":"","pauseType":"delay","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":480,"y":280,"wires":[["1c1955b4.2cc83a"]]},{"id":"25e25155.db97ae","type":"function","z":"5a966310.e46a0c","name":"flow.set masteron","func":"flow.set(\"masteron\",msg.payload);\nflow.set(\"timeron\",0);\nmsg.payload=flow.get(\"timeron\")|| 0;\nreturn msg;","outputs":1,"noerr":0,"x":410,"y":1460,"wires":[[]]},{"id":"f1417b6f.3b1008","type":"mqtt in","z":"5a966310.e46a0c","name":"Master On","topic":"garden/valve/master","qos":"2","datatype":"auto","broker":"e0ba888b.b9d328","x":120,"y":560,"wires":[[]]},{"id":"c2c1677e.4290e8","type":"inject","z":"5a966310.e46a0c","name":"1 Second Trigger","topic":"","payload":"","payloadType":"date","repeat":"1","crontab":"","once":false,"onceDelay":0.1,"x":150,"y":880,"wires":[["8f694a9e.42fc78"]]},{"id":"8f694a9e.42fc78","type":"function","z":"5a966310.e46a0c","name":"Format Watering Time","func":"var elapsed = flow.get(\"timeron\")|| 0;\nvar total_elapsed = flow.get(\"daily_total\")|| 0;\nvar running = flow.get(\"masteron\")|| \"\";\nvar minutes = 0;\nvar seconds = 0;\nvar total_minutes = 0;\nvar total_seconds = 0;\nif (running === \"1\"){\n elapsed = elapsed + 1;\n total_elapsed = total_elapsed + 1;\n flow.set(\"timeron\",elapsed);\n flow.set(\"daily_total\",total_elapsed);\n} else {\n flow.set(\"timeron\",0);\n}\nminutes = Math.floor( elapsed / 60);\ntotal_minutes= Math.floor( total_elapsed / 60);\nseconds = elapsed - (minutes * 60);\ntotal_seconds = total_elapsed - (total_minutes * 60);\nseconds = (\"0\" + seconds).slice(-2);\ntotal_seconds = (\"0\" + total_seconds).slice(-2);\nmsg.payload= \"Watering Time \" + minutes + \":\" + seconds+\"<br/> Total Today \"+total_minutes+\":\"+total_seconds;\nreturn msg;","outputs":1,"noerr":0,"x":400,"y":880,"wires":[["e5eaccc4.5a078"]]},{"id":"89c3c8b.5fd2f38","type":"comment","z":"5a966310.e46a0c","name":"Watering Time Text","info":"","x":110,"y":840,"wires":[]},{"id":"e5eaccc4.5a078","type":"ui_text","z":"5a966310.e46a0c","group":"9403836f.e9086","order":3,"width":"4","height":"2","name":"Timer Text","label":"","format":"{{msg.payload}}","layout":"col-center","x":630,"y":880,"wires":[]},{"id":"34c15d2c.7b0bf2","type":"ui_gauge","z":"5a966310.e46a0c","name":"Rain","group":"928b09a9.067248","order":7,"width":"2","height":"2","gtype":"donut","title":"Rain","label":"","format":"{{value}}","min":0,"max":"1","colors":["#00b500","#e6e600","#ff0000"],"seg1":"","seg2":"","x":270,"y":780,"wires":[]},{"id":"c2b9bb3.53b5d48","type":"comment","z":"5a966310.e46a0c","name":"Is Garden Arduino Alive?","info":"","x":130,"y":1100,"wires":[]},{"id":"18a336d5.869789","type":"inject","z":"5a966310.e46a0c","name":"1Minute Trigger","topic":"","payload":"1","payloadType":"str","repeat":"60","crontab":"","once":false,"onceDelay":0.1,"x":150,"y":1160,"wires":[["a94f5dae.621d4"]]},{"id":"a94f5dae.621d4","type":"mqtt out","z":"5a966310.e46a0c","name":"","topic":"garden/alive","qos":"2","retain":"false","broker":"e0ba888b.b9d328","x":370,"y":1160,"wires":[]},{"id":"70ad55e2.38d53c","type":"mqtt in","z":"5a966310.e46a0c","name":"","topic":"gardenuino/alive","qos":"2","datatype":"auto","broker":"e0ba888b.b9d328","x":140,"y":1220,"wires":[["a5000345.72cf9"]]},{"id":"a5000345.72cf9","type":"dead-man-switch","z":"5a966310.e46a0c","name":"","delay":"5","delayUnit":"minutes","x":360,"y":1220,"wires":[["51952e75.d8d2b","5450d60b.97a8d8"]]},{"id":"51952e75.d8d2b","type":"function","z":"5a966310.e46a0c","name":"","func":"//var msg1 = 0;\nif (msg.payload == \"timeout\") { \n msg1 = { payload:1 };\n 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You'll have to get your own API key from OpenWeatherMap.org (https://openweathermap.org/api) for the local weather node and provide your own credentials for the email node. I use outlook.com to send emails to my gmail account. You can use your ISP or whoever you like. I use the email node to send an email if communications is lost between the Pi and the Arduino.
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