For this project we’re going to need nine different types of components, along with a heat sink of some sort. Three different types of resistors are needed. I went with 1W ratings for each resistor. One 2512 130Ω surface mount resistor, one 2512 2.2kΩ surface mount resistor, and two 2512 200Ω surface mount resistors. All parts are linked in the “Bill of Materials” section. One 2.4in TFT 240×320 SPI LCD is needed, along with a Cree 6500K SMD high-power LED. One BD 139-16 and one BC 547 transistors are needed. Two 3-position 200mA, 30V slide switch is needed in order to turn the device on as well as switch brightness levels. A zero-insertion force 1mm LCD port is needed as well. One Arduino will be needed to control the assembly, along with a power source and a PCB to connect everything.

LCD: $17.56

• Round Heat Sink: $3.63
• LED: $0.34
• 130Ω Resistor: $0.36
• 2.2kΩ Resistor: $0.41
• BD 139-16 Transistor: $0.40
• BC 547 Transistor: $0.20
• Slide Switches: $0.76
• 200Ω Resistor: $0.76
• LCD Port: $1.01
• PCB: Varies wildly, PCB Way is a good one, or Mill Your Own PCB
• Arduino Nano 3-Pack: $15.98, $5.33/piece
• Total: $30.74

I’ve included the necessary files to manufacture a pocket projector, including the schematic, PCB, and necessary libraries on this project’s GitHub page, as well as in the "Files" section of this project.