Case for Raspberry Pi 4, HifiBerry DAC+ RCA and 40 mm Fan
Description
This is a case for a Raspberry PI 4, a HifiBerry DAC+ RCA and a 40 x 40 x 10 mm Fan. The case is optimized for passive and active cooling efficiency. By putting the RPi vertically a chimney effect is created. Cold air enters from below and leaves the case at the top, flowing around both sides of the RPi. The measured CPU temperature in idle state is 50 °C with powered down fan. If your PI is just for music, you will not need a fan. It is recommended to put heatsinks on the RPi's CPU, Network controller, and Graphics card with the slits placed vertically. Additional heatsinks on the memory can enhance cooling efficiency. A 40 x 40 x 10 mm Fan keeps the RPi cool under full load. With the fan at minimum speed (barely audible) the CPU temperature stays under 60° under full load. The hole at the side is meant for a TSOP4838 IR Receiver (find tutorials online) soldered to GPIO Pin 23 of the Hifibiberry DAC. For fan control I use GPIO PIN13 and Hardware PWM (dtoverlay=pwm,pin=13,func=4) with a control script in python. The PINs mentioned are not used by the DAC so there are no conflicts between DAC, IR receiver and Fan control. You are going to need screws M4x12 for the fan and M2x5 for the RPi. First fix the RPi with screws and then add the DAC. Printing is easy in PLA and I recommend a small support structure for the SD-Card slot. Naming and versioning at Hifiberry can be confusing but you can look up 3D Models at https://www.hifiberry.com/docs/hardware/3d-models-of-hifiberry-boards/ . This case is designed for the DAC RCA (hifiberry-dac-plus-rca-2.6.step). Enjoy :-).
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