Já mostrei no passado um dos projetos relacionados com Raspberry Pi que não deu certo, a placa de expansão HDMI.
A MotherBone PiOne é outro projeto que iria postar sobre mas que também não deu certo, mas o motivo não foi técnico, mas por falta de financiamento.
Essa placa adicionava diversas formas de IO, relês, etc, ao Raspberry Pi ou Beagle Bone Black e inclusive era possível utilizar ambos em conjunto. As especificações eram bem extensas:
- Form Factor: 3.5 inch industrial standard motherboard (5.8” x 4”) (5.25”, 3.5” external drive chassis)
 - CPU Requirements: BeagleBone Black and/or Raspberry Pi single board computers simultaneously (Not Included)
 - Power System: Three 5VDC switching power supplies (52W maximum, 22W nominal)
 - Input Power: 7.5-36VDC, single input connection
 - 4-port High Powered USB Hub: Four downstream USB ports with extended current capability can be used by BeagleBone Black or Raspberry Pi
 - Raspberry Pi Pass Thru: Raspberry Pi I/O header interconnect with Pass Thru Connection for Raspberry Pi peripherals
 - BonePi™ Bridge™: Jumper selectable I2C and null modem connections and relay access for Raspberry Pi
 - 16-bit GPIO: 5V TTL level 16-bit GPIO (I2C Slave) can be used by Raspberry Pi or BeagleBone
 - I2C, I2C2 Bus: Individual BeagleBone Black and Raspberry Pi 5-pin I2C Master access with additional BeagleBone Black 5-pin I2C2 voltage isolated port
 - Solid State Relays: Five high-powered solid state relays for AC, DC and analog switching
 - Analog Inputs: Seven wide range analog voltage inputs with trim adjust for voltage range select
 - PWM Output: Two high-current, open drain MOSFET PWM outputs
 - UART2, UART4: Two fully opto-isolated +5V TTL voltage level translated UART connections
 - J1 Serial Console (UART0): BeagleBone Black J1 serial connection accessible on BonePi™ Bridge™
 - MIDI (UART1): One standard opto-isolated 5V MIDI IN and OUT connection
 - Front Panel Connections: Traditional motherboard power button, power LED and reset button connections
 - Cape EEPROM: Standard BeagleBone Black required expansion cape EEPROM with address select
 - Temperature: Operating 0-60°C; Storage -20-+85°C
 - RJ45 Ethernet: Accessed from BeagleBone Black and Raspberry Pi Model B (not included)
 - HDMI Video, Audio: Accessed from BeagleBone Black and Raspberry Pi Model B (not included)
 
| Placa com Raspberry Pi e Beagle Bone Black | 
A meta era de US$60000 e foi arrecadado somente US$4,270. Acredito que a combinação por ser um produto de nicho, preço( US$200 para cima ) e talvez falta de melhor divulgação fizeram com que o financiamento não fosse concluído.
Fonte: https://www.kickstarter.com/projects/532391021/motherbonetmpionetm

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