Arduino Projects of note: Difference between revisions

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https://edwardmallon.wordpress.com/2014/05/21/using-a-cheap-3-ds3231-rtc-at24c32-eeprom-from-ebay/
https://edwardmallon.wordpress.com/2014/05/21/using-a-cheap-3-ds3231-rtc-at24c32-eeprom-from-ebay/


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


== LCD ==
== LCD ==

Revision as of 19:36, 18 January 2015


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/

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

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