Garden manager bill of materials
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PartQuantityUnit PriceTotal PriceRequired?Have?Product URLsComments
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Power
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See "Battery Board" spreadsheet tab
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Sensor node
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Arduino nano (or any arduino)1 for each nodeYes
one for the receiver hub and one for each sensor node
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nrf24l01 module1 for each nodeYes
http://www.ebay.com.au/itm/Precision-1X-NRF24L01-2-4GHz-Wireless-RF-Transceiver-Module-For-Arduino-ATAU-/271743918156
one for the receiver hub and one for each sensor node, see how to install it here https://docs.google.com/document/d/1K5OXfkYGutQqQcJCT38XA3hmYE5v4orgO_3Y8B9YWzM/edit#
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Capacitors1 for each nodeYes
3.3uf to 10uf, I used 10uf - one for each nrf module
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Breadboard1 for each nodeYes
one for the receiver hub and one for each sensor node
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Hookup wiresYes
male/male and either male/female or female/female
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photo resistorYes
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thermistorYes
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soil moisture sensor10Yes
optical fiber-based soil moisture sensor from SENSORICA. The soil moisture sensor can be an off-the-shelf module or can be made from 2 nails with wires soldered to them and a resistor, wired up similarly to the photoresistor and thermistor.
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Resistors1 for each sensorYes
Most examples use 10k resistors but it’s technically possible to use 1k resistors although it alters the final output value. The resistor in combination with the photoresistor/thermistor acts as a voltage divider. Google “arduino photoresistor” or “arduino thermistor” to see the various tutorials
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USB cableYes
to fit the arduino
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Graph Hub UI
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Breadboard1Yes
one for the receiver hub and one for each sensor node
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Arduino nano (or any arduino)Yes5
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nrf24l01 module3
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Capacitors1Yes
3.3uf to 10uf, I used 10uf - one for each nrf module
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RTC module and batteryYes1
http://www.ebay.com.au/itm/New-Real-Time-Clock-Module-Arduino-RTC-DS1302-For-AVR-ARM-PIC-SMD-/121370859759
This is required for the interface to display data because it needs the date/time otherwise the graphs don’t display properly. The electronics and wireless transmission will work however without it, to the point the raw data can be viewed via the serial monitor on the RPi/PC. But the interface won’t work if it’s not connected.
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USB cableYes
to fit the arduino
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Server computer (Ubuntu)Yes3
eg. RPi, or any standard Ubuntu PC
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1602 LCD Hub UI
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Breadboard1Yes
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Arduino nano (or any arduino)1Yes
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nrf24l01 module1Yes3
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Capacitors1Yes
3.3uf to 10uf, I used 10uf - one for each nrf module
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1602 LCD display1No1
http://www.ebay.com.au/itm/Hot-LCD-Display-Character-Module-LCM-16x2-HD4478Controller-Blue-Blacklight-1602-/301216774390
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1602 LCD display TTL adapter
1No1
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Irrigation System
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See "Irrigation Circuit" spreadsheet tab
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Misc
These are used for the interface that makes can be plugged into the sensor node to set the ID. Makes it easier to set the ID than having to modify the sketch and re-upload it.
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Momentary tactile buttons3No
http://www.ebay.com.au/itm/Miniature-Micro-Switch-PCB-Momentary-Tactile-Key-Tact-Switch-Button-50mA-12V-DC-/191490960647
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1602 LCD display1No1
http://www.ebay.com.au/itm/Hot-LCD-Display-Character-Module-LCM-16x2-HD4478Controller-Blue-Blacklight-1602-/301216774390
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1602 LCD display TTL adapter
1No1
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Proto/strip boardNo
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Male pin headersNo
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Female pin headersNo
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NOTES: Notes:
The nRF modules can be attached to the breadboard via female to male jumper cables, or by soldering a breadboard adapter made from protoboard, male pin headers, and female pin headers (2 rows of 4 each)
The breadboard adapter requires a little bit more work than directly attaching to the breadboard via hookup cables, but using the adapter results in a more rigid prototype where the nRF module is less likely to accidentally come loose.
A breadboard adapter can be seen here:
http://projectsfromtech.blogspot.com.au/2013/05/nrf24l01-arduino-communication-on.html
Or youtube/google “nrf24l01 breadboard adapter” and there are more examples, as well as video how-tos.
Here’s an example of a “no-solder” breadboard adapter:
https://www.youtube.com/watch?v=xAMFl9AAraU
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nRF Wireless
Optical soil moisture sensor
Window Farming
atmega8/328 board
iPot
Irrigation Circuit
ESP WiFi Wireless
BatteryBoard
Outside Gardening
First prototype
Summary