DIYbio Orbital Shaker V 1.0

thingiverse

UPDATE July 15, 2018: Version 2.0 is now available at https://www.thingiverse.com/thing:2983846. We've uploaded a brand-new platform with slots designed right into it. This allows users to thread straps onto the platform to secure containers of all sizes. The file name for this new platform is NewPlatform.stl. Alternative platforms have been created and shared by Thingiverse user Kabong at https://www.thingiverse.com/thing:2812487. UPDATE February 7, 2018: We've discovered that the hex nut on the coupler slips off easily. To fix this, we recommend hot gluing the coupler onto the stepper motor shaft. If you need to remove the motion control assembly entirely, simply unscrew the retainer holding the bearing above the stepper. We've completely overhauled the motion control system using M3 bolts (3mm diameter threading, 12mm long threading, 2mm thick head, 5mm diameter head). This makes it easy for you to assemble and disassemble everything. We've also designed a shaft coupler for the stepper motor that uses an M3 bolt and corresponding hex nuts. We found that friction welding along the edge of the nuts keeps them securely in place when tightening the bolts. Unfortunately, hot glue isn't strong enough for this job. Close-up shots of the shaft coupling show before and after friction welding the nuts into place. Assembly and wiring diagrams will be posted soon. Our new design uses one fewer 608zz bearing, so you'll only need five now. This is our very first attempt at a DIYbio orbital shaker. Check out this video demo to see it in action: https://www.youtube.com/watch?v=TnfxUq-xGas A video explaining the assembly process for the motion control system can be found here: https://www.youtube.com/watch?v=FlnDQZjm9aY. Using 608ZZ bearings, the motion control is smooth, reliable, and quiet. We'll post the wiring diagram and assembly instructions soon. The files are available now for anyone who wants to take a crack at it or start modifying the design. The SketchUp file is also included in the package. Here's what you'll need: * 12V stepper motor * Pololu DRV8825 stepper driver * Arduino Micro Pro * Potentiometer * Rocker Switch * DC Adapter (Female) * 608ZZ bearings (x5) * 3mm bolts (x3) * 3mm nuts (x3) * 3mm screws (x3) We used a combination of friction welding and hot glue to assemble the motion system. Hot glue is applied after the bearings are inserted, with a thin bead placed around the edge. This makes it easy to remove later if desired. Nuts are friction welded in place. The Arduino sketch we used is as follows: // Simple Stepper Motor Control // // by Achim pieters, www.studiopieters.nl // // Defines pins numbers const int stepPin = 7; const int dirPin = 8; int customDelay,customDelayMapped; // Defines variables void setup() { // Sets the two pins as Outputs pinMode(stepPin,OUTPUT); pinMode(dirPin,OUTPUT); digitalWrite(dirPin,HIGH); //Enables the motor to move in a particular direction } void loop() { customDelayMapped = speedUp(); // Gets custom delay values from the custom speedUp function // Makes pulses with custom delay, depending on the Potentiometer, from which the speed of the motor depends digitalWrite(stepPin, HIGH); delayMicroseconds(customDelayMapped); digitalWrite(stepPin, LOW); delayMicroseconds(customDelayMapped); } // Function for reading the Potentiometer int speedUp() { int customDelay = analogRead(A0); // Reads the potentiometer int newCustom = map(customDelay, 0, 1023, 300,4000); // Converts the read values of the potentiometer from 0 to 1023 into desired delay values (300 to 4000) return newCustom; }