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• Tray tilting logic

  Tony Kambourakis • 12/13/2016 at 00:42 • 0 comments

  The egg tray must tilt every 4 hours. When the incubator controller is switched on it must determine the current position of the tray. If either motor switch sensors are activated it implies the tray is in the middle. As such it will activate the motor to the default position (LEFT) until the LEFT switch is activated and start the timer. If a switch is already active it will leave it in that position and start the timer. The following state diagram illustrates this logic.

• DHT22 Pins

  Tony Kambourakis • 12/06/2016 at 05:12 • 0 comments

  The DHT22 4-pin package comprises the following PIN assignments

• Fritzing Schematic

  Tony Kambourakis • 02/28/2016 at 13:07 • 0 comments

• Schematic

  Tony Kambourakis • 01/28/2016 at 13:30 • 0 comments

• Level Shifting and SDA/SCL Pull Ups

  Tony Kambourakis • 01/26/2016 at 03:00 • 0 comments

  The ESP8266 (ESP-12E), the core of the NodeMCU devkit, requires a 3.3V supply. The GPIO pins also supposedly operate at 3.3V logic levels. This can be confirmed with the NodeMCU DevKit official documentation:

  不得对开发板输入超过 5V 以上的电源电压,也不得将开发板 GPIO 直接连接到 5V 电平的外设上。如果需要连接,需要电平转换电路,否则可能造成不可逆转的损坏。

  The board shall not enter more than 5V supply voltage, nor will board GPIO directly connected to 5V level peripherals. If you need to connect
  Then, we need to level conversion circuit, or it may cause irreversible damage.

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• Noisy DC Motor

  Tony Kambourakis • 01/09/2016 at 15:56 • 2 comments

  Ran some tests with both a desktop power supply (3V-12V@1.5A) and a power pack (12V@1A) with the motor shield. The noise generated by the small DC motor is significant across both supplies. Both supplies were fed into my own 12V to 5V regulator circuit shown below.

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• NodeMCU DevKit Pins

  Tony Kambourakis • 12/20/2015 at 14:32 • 0 comments

• Node MCU Motor Shield

  Tony Kambourakis • 12/20/2015 at 13:38 • 9 comments

  Connected small DC motor to test the Node MCU motor shield. The shield is based on the L293D quadruple high-current half-H drivers typically used to drive motors.

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• Driving LCD with I2C

  Tony Kambourakis • 12/19/2015 at 16:17 • 3 comments

  Established I2C link to TWI 2004 204 20x4 LCD module from the ESP8266. The ESP8266 port for Arduino thankfully includes an I2C implementing in the Wire library.
  

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