This is a project I made some time ago.
Almost finished board straight out of a reflow oven. USB host port and Click board-header connectors still missing, will hand solder them later on.
Board was developed from scratch following Octavo Systems reference design. Multiple components were not available for ordering so it was not possible to just download their board design files and order the boards and components.
- Octavo Systems SiP ( System In Package OSD3358 ) containing:
- TI AM335x ARM Cortex-A8 1GHz
- 512MB DDR3 Main memory
- TPS65217 Power management IC
- TL5209 Low-dropout voltage regulator
- 100+ passive components
- 64GB eMMC ( AM335x supporting only 32GB at the moment )
- SD card slot
- USB-A host port
- Micro-USB client port
- Some buttons and LEDs
- BeagleBone Debian 10.03 ( with modified u-boot to be able to boot it on the custom board. )
After reflow soldering, under a magnifying glass
Board preview in EAGLE
Board layout in EAGLE
Board manufacturing process
Ordering process was easy from https://jlcpcb.com/. They have this detailed process log.
Bottom side of the board
Top side of the board without components
Board taped down to hold it in place
About to spread some solder paste
Spreading the solder paste on to the board
Solder paste spread on to the board
Some of the components used in the board
All the components placed, before reflowing
Reflowing the board
Custom reflow controller board controlling 4 x 230V infrared heating elements through a 3v DC -> 230V AC SSR ( Solid State Relay ). Temperature is read through a K-type thermocouple connected to MAX31855 thermocouple-to-digital IC.