OpenDrop Version 4 is the newest edition of the popular OpenDrop Digital Microfluidics Platform with a lot of new features.
The OpenDrop V4 is modular electrowetting controller. The driver board is equipped with a connector that can host a circuit board cartridge with a 14×8 electrode array and 4 reservoirs. The liquids stay on a thin, hydrophobic foil laminated to the circuit board . The device is powered from USB though an included USB-C cable. All the voltage level are generated on the device and can be set with the built in soft menu from 150-300 Volts, DC or AC.
The modular concepts of the OpenDrop V4 allows different configurations of cartridges:
1. The device comes with a preinstalled gold coated electrode array board that can be coated with any dielectric layer and hydrophobic coating suitable for electrowetting.
2. The Open Cartridge Kit (not included, sold separately) is en easy start to make your own electrowetting cartridges for topless digital microfluidic applications using readily available materials.
3. The OpenDrop V4 Cartridge (not included, sold separately) is a newly developed, fully functional cartridge capable of “move, mix, split and reservoir dispensing”. The 4×8 electrode array and 4 reservoirs are laminated with a 15um ETFE foil, hydrophobic coating and ITO top cover.
The OpenDrop V4 can be operated standalone and droplets can be moved through the built in joystick. A control software to program sequences of patterns from a computer is available as a free download. The board is also compatible with Adafruit Feather M0 controller boards and can be reprogrammed through the free Arduino IDE for custom specific applications. A sample code with the instruction to activate electrodes can be found on the OpenDrop GitHub.
- Modular Cartridge System
- Connector to connect electrode board with up to 128 channels
- Gold coated 14×8 electrodes array, 2.75 mm x 2.75 mm in size, 4mil gaps
- Reservoirs – the new electrode array features 4 CT-type reservoirs
- AC and DC voltage generated on the device form USB power. True AC voltage driving capability (up to 300VAC).
- 32bit AVR SAMD21G18 microprocessor with plenty of memory and power
- Electronic settings for voltage level, frequency and AC/DC selection
- Electronic reading of actual voltage level
- One connector for communication and powering (USB-C)
- Optical isolation of the high-voltage electronics trough opto-couplers and PhotoMOS
- New polyphonic audio amplifier and speaker (it’s a synth!)
- Cartridge presence detection
- Feedback amplifier
- Super flat OLED Display
- Nice joystick and 2 buttons, 3 LEDs
- Reset button
- All files open source, designed on KiCAD
- Assembled, programmed and fully tested OpenDrop V4 electronic board
- 1x gold coated electrode array circuit board (no dielectric or hydrophobic layer)
- USB cable