Arduino Projects of note

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RTC

I have some zs-042 RTC , it has a DS3231 RTC and what looks like an ATmega32 on it.

20141201 214606.jpg

https://edwardmallon.wordpress.com/2014/05/21/using-a-cheap-3-ds3231-rtc-at24c32-eeprom-from-ebay/ very good writing. also notes on using the eeprom are linked.

http://misclab.umeoce.maine.edu/boss/Arduino/bensguides/DS3231_Arduino_Clock_Instructions.pdf <- this worked.

used this: https://github.com/JChristensen/DS3232RTC ( worked )

also on board "AT24C32 EEPROM" https://breadboardtronics.wordpress.com/2013/08/27/at24c32-eeprom-and-arduino/ ... a place to store data.


/rtc set

LCD

Liquid Crystal Display

Some notes:

Voltage Comparator Based Sensor

Picked up a soil moisture sensor from Deal Extreme ad 2.23 USD$

http://www.dx.com/p/soil-humidity-moisture-detection-sensor-module-blue-black-white-200142

Sku 200142 1.jpg

It's based on a lm393 voltage comaparator. Many variation exist, for things like sound and light aswell.

This is an analog to digital sensor NOT a 1 wire sensor, so it soaks up an analog pin.

Resources:

Arduino Code example:
http://arduino-info.wikispaces.com/Brick-LightSensor-Analog-Digital

LM 393 Datasheet:
http://www.ti.com.cn/cn/lit/ds/symlink/lm293-n.pdf

This chip is a voltage comparator.

The board has d0 digital out and A0 Analog out.

Using the variable potetiomenter you can set the threshold where D0 goes high ( presmably ).

this is a good exmaple of how to "do" this circuit. https://www.mysensors.org/build/light-lm393

From analog to digital

So you got a bunch of cheap sensors, but they are all voltage oriented, like lm 939 and tmp36 and lm35, but you want to hook up a pile of them. wouldn't it be great if you could "convert" the voltage changing sensors to 1 wire or I2C ?

By using a buss ( like I2C ) you can attach many sensors to a single pair of arduino digital pins.

You can! Some notes so far below.

Analog to I2C

http://www.ti.com/lit/ds/symlink/ads1000-q1.pdf

I2C What resistor

http://electronics.stackexchange.com/questions/1849/is-there-a-correct-resistance-value-for-i2c-pull-up-resistors

level shifting : http://playground.arduino.cc/Main/I2CBi-directionalLevelShifter

one I2C device many outputs

  • pca9685 ic

Working with data structure and EEProm

http://playground.arduino.cc/Code/EEPROMWriteAnything

http://arduino.cc/en/Reference/EEPROMRead

Measurting electrical usage with arduino

Amps with Arduino

  • use 0.01 Ohm Shunt resistor
  • arduino can measure 0 to 5 v in 4.9 mVa resolution. ( 1024 setps )
  • use op amp AD623ANZ to get volts up for arduino measurement.

YHDC SCT013-000 CT

measure amp and volts, non-invasively

https://www.poweruc.pl/blogs/news/non-invasive-sensor-yhdc-sct013-000-ct-used-with-arduino-sct-013


Opamp.jpg

multi tasking

https://learn.adafruit.com/multi-tasking-the-arduino-part-1/a-clean-sweep

other projects

Simple AD8307 rf power meter for sweeper using ad9850 dds and arduino for testing crystals etc
http://blog.riyas.org/2015/04/a-simple-standalone-antenna-analyzer-with-ili9341tft.html

My Projects