Published May 24, 2018 © GPL3+

Double Plant Watering 2

An other double plant watering version, now with more autonomy and less power consumption.

IntermediateWork in progress23,832

Things used in this project

Hardware components

SparkFun Arduino Pro Mini 328 - 5V/16MHz

Resistor 1k ohm

1N4007 – High Voltage, High Current Rated Diode

Breadboard (generic)

Micro-USB to USB Cable (Generic)

you have to cut it

General Purpose Transistor NPN

Story

Hi, this is the second version of my double plant watering. In this version we can see a small 5V Arduino pro mini 328, you can find it online.

There are two brushless usb pumps,

half plastic water bottle, tubes, two transistors bc368, 1k resistors, 3 diodes, an usb cable, a breadboard.

When you connect the usb cable, the pump 1 starts watering for 2 seconds, the same for the pump 2, then the microcontroller goes to sleep and wake up the next day at the same time for watering.

How can I manually wet plant?

You can simply press the reset button.

In sleep mode Arduino absorbs only few microAmps.

A diode in series with the positive power supply will reduce the current in wake up mode of some mA.

I have cutted the trace of the power led for saving energy, the average power consumption is only some microAmps instead of 12mA thanks to madcoffe power reduction technique, I hope this will inspire you, bye!

Code

Double plant watering 2

#include <LowPower.h>

byte pump1=7;               //pump1 at pin 7
byte pump2=8;               //pump2 at pin 8
int tempo=2000;             //watering time of 2 seconds
int i=0;                    //memory counter i start to 0
byte ledboard=13;           //on board led at pin 13

void setup()
{
pinMode(pump1,OUTPUT);       //pump1 output
pinMode(pump2,OUTPUT);       //pump2 output
pinMode(ledboard,OUTPUT);    //on board led output
digitalWrite(ledboard,LOW);  //turn off Arduino led
digitalWrite(pump1,LOW);     //start with both pump turned off
digitalWrite(pump2,LOW);
}

void loop() 
{
  if(i==0)                  //if reset i
  { 
  digitalWrite(pump1,HIGH); //turn on pump1 
  delay(tempo);             //wait some time
  digitalWrite(pump1,LOW);  //turn off pump1
  digitalWrite(pump2,HIGH); //turn on pump2
  delay(tempo);             //wait some time
  digitalWrite(pump2,LOW);  //turn off pump2
  }
  i++;  //i=i+1
  // Enter power down state for 8 s with ADC and BOD module disabled
  LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); //sleep 
  if(i==10800) //every day
  i=0;          // reset i
}