Original project I found [here](https://www.hackster.io/sfrwmaker/soldering-iron-controller-for-hakko-907-v-2-fc75d7). Thank the Alexander. I tweaked it for my box. All the steps with in this [blog](http://bit.ly/2ZMqTdI)
The Arduino platform has become quite popular with people just starting out with electronics. It is an open-source hardware design, based on microcontroller board designs and provide sets of digital and analog I/O pins that can be interfaced to various expansion boards ("shields") and other circuits. The boards feature serial communications interfaces, including USB on some models, for loading pro...
This schematic uses two LDRs (Light dependent resistor) to sense the light and a servo motor to automatically rotate the solar panel in the direction of the sun light. The Arduino code is available on [Arduino Solar Tracker using LDR and Servo Motor]