Show Posts
Pages: [1]
1  Using Arduino / Sensors / Re: Real Time Clock Testing Results DS3231/PCF8563/MCP79400 on: September 27, 2014, 11:23:02 pm
I suspect that RTC accuracy more depends on the Xtal tolerance.
BTW, I like the PCF8563 because it has an interrupt output pin that I can use for timed sleep and wake-up of the Arduino to save battery power.
2  Using Arduino / Project Guidance / Re: Long range connectivity Arduino-------- on: September 27, 2014, 11:16:26 pm
I am using the APC220 RF module which operates at 430MHz. Multi-point using RTC timer controller measurement stations, every 4 hours. Should be enough time to support 41 stations, with collision detect.
With a simple quarter wave antenna (16.5 cm wire) replacing the stock antenna, I can cover my whole 5 acre vineyard.
Agree with other replies that for 7 km distance you will need high gain antennas, direct line of sight, ... and a ham radio license depending on frequency used. Maybe use a GSM module shield.

3  Using Arduino / Project Guidance / Re: Long range connectivity Arduino-------- on: September 27, 2014, 11:14:29 pm
I am using the APC220 RF module which operates at 430MHz. Multi-point using RTC timer controller measurement stations, every 4 hours. Should be enough time to support 41 stations, with collision detect.
With a simple quarter wave antenna (16.5 cm wire) replacing the stock antenna, I can cover my whole 5 acre vineyard.
Agree with other replies that for 7 km distance you will need high gain antennas, direct line of sight, ... and a ham radio license depending on frequency used. Maybe use a GSM module shield.

4  Using Arduino / Project Guidance / Re: remote Multiple point sensor dataloger using APC220 on: September 27, 2014, 10:56:48 pm
I plan to use the APC220 in a multi-sensor network. Could not find out how to make the APC220 work in multi-point config, so decided to use timer controlled transmissions and check for incoming data (carrier detect) before transmitting every 4 hours from measurement 3 locations. A central APC220 based receiver will log the incoming data.

Below is a picture of my soil sensor and RF module prototype:

5  Using Arduino / Installation & Troubleshooting / Re: Test Arduinos functionallity on: September 27, 2014, 10:45:58 pm
Try the APC220 430 MHz RF module. It's easy to check: serial data in/out. Just connect it to your serial output port to transmit data.
Receiver module can be connected to a PC USB port, and you can see the transmitted data in a terminal emulator.

http://www.vanderleevineyard.com/1/post/2014/09/sneak-preview-vinduino-gen-2.html

6  Using Arduino / Sensors / Re: Soil Moisture sensor on: January 21, 2013, 11:23:18 pm
Feel free to have a look at my blog postings regarding soil moisture measurement. Includes guidelines how to build and calibrate a gypsum block soil moisture sensor.

link: http://vanderleevineyard.com/1/category/vinduino/1.html



7  Using Arduino / Project Guidance / Re: Soil moisture sensor on: November 16, 2012, 10:54:17 pm
Check out this link for alternating current soil moisture measurement:
http://vanderleevineyard.com/1/category/vinduino/1.html
Pages: [1]