Arduino Projects of note
- cheap good rtc http://www.dx.com/p/ds3231-high-precision-real-time-clock-module-blue-3-3-5-5v-222910#.VGg-R_nF98E
RTC
I have some zs-042 RTC , it has a DS3231 RTC and what looks like an ATmega32 on it.
https://edwardmallon.wordpress.com/2014/05/21/using-a-cheap-3-ds3231-rtc-at24c32-eeprom-from-ebay/
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
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
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
one I2C device many outputs
- pca9685 ic
