Film Developing Bot for AP Dev Tanks

thingiverse

Hello Everybody, this is just a quick and dirty design of a Film Development Bot, for use with AP Developing Tanks. If you are into developing your own film, you probably know how tiresome it is to babysit your developing tank just to turn it every 30 seconds. With this design, a cheap servo, microcontroller and a bit of electronics knowledge you can just sit back and have a cup of coffee, while your development bot does the rest. I used a little leftover lipo battery for powering the electronics, but if you don't feel comfortable messing with lipo batterys, you can wire up a usb socket and power everything externally from a phone charger or a powerbank. I don't know much about programming at all, so my code is full of nonos and you probably schould write your own, however i will make it available for download for those who can't or simply don't want to write their own. I used the SimpleServo library, so you will need to download that as well as the needed files to use the Digispark board with the Arduino IDE. SimpleServo Project page: https://github.com/digistump/DigisparkArduinoIntegration/tree/master/libraries/DigisparkSimpleServo Digispark: http://digistump.com/wiki/digispark To setup the bot for developing your film, wait for the beep after power up, then press button 2 once to enter setup mode. After that you enter the desired value with button 1 and confirm with button 2: 1: Developing time: press button 1 once per minute of desired developing time, confirm by pressing button 2 once. 2: time between agitations: press button 1 once per 30 seconds of desired time between agitations, confirm by pressing button 2 once. 3: agitation time: press button 1 once per second of desired agitation time, confirm by pressing button 2 once. 4: first agitation: press button 1 once per 30 seconds of desired length for the first agitation, confirm by pressing button 2 once. 5: fixing time: press button 1 once per minute of desired fixing time, confirm by pressing button 2 once. Once all values have been entered you will hear 2 beeps. After that you can start the programm by pressing button 1 once. The programm will halt automatically after the developing stage is completed. Press button 1 once to continue with the fixing stage after you have dumped your developing agent and filled in your fixer. Parts: Microcontroller:https://www.banggood.com/Digispark-Kickstarter-Micro-USB-Development-Board-For-ATTINY85-Arduino-p-1038088.html?rmmds=search&stayold=1&cur_warehouse=CN Servo: https://www.banggood.com/TowerPro-SG90-Mini-Gear-Micro-Servo-9g-For-RC-Airplane-Helicopter-p-1009914.html?rmmds=search&cur_warehouse=CN Buttons: https://www.banggood.com/100pcs-Mini-Micro-Momentary-Tactile-Tact-Switch-Push-Button-DIP-P4-Normally-Open-p-917570.html?rmmds=search Charging Board: https://www.banggood.com/Micro-USB-TP4056-Charge-And-Discharge-Protection-Module-Over-Current-Over-Voltage-Protection-18650-p-1183439.html?rmmds=search Battery: https://www.banggood.com/Eachine-H8C-Mini-RC-Quadcopter-Spare-Parts-3_7V-250mAh-Lipo-Battery-H8C-006-p-1020647.html?rmmds=search&cur_warehouse=CN Power Switch: https://www.banggood.com/20pcs-SS12D00G3-2-Position-SPDT-1P2T-3-Pin-PCB-Panel-Mini-Vertical-Slide-Switch-p-1000847.html?rmmds=search&cur_warehouse=CN