Yapa

"Yet Another Paparazzi Autopilot".
This autopilot was not designed to replace any other, but just as another version of the same and is posted here just in case it might be useful to anybody. The Yapa is very similar to the Twog_v1 but has standard 100mil headers for direct standard servo connections, and has an option to put the xbee on the autopilot-board itself.

When would you use a TWOG:

• size and weight matter
• you have a Molex Crimper

When YAPA might be useful:

• you want to use the exact same airframe file as in a TWOG
• but you want mounting holes
• or you want standard servo connectors or have high power servo's
• a few extra grams don't matter
• want to connect any serial device (from a TLL/RS232 GPS to the latest RS422 XSens Mti-G)
• you want to connect an rs232/485/422 modem or an XBee directly

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  Rendering

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  Top side

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  Bottom side

Hardware Revision History

Version #	Release Date	Release Notes
v1.00	07/2010	Initial release of Yapa v1

Features

• Basic Design very similar to Twog_v1 (uses same autopilot configuration file 'tiny2_1_1.h')
• 100mil headers instead of the (nice and lighter) Molex connectors
• Support Holes (e.g. use M3 bobbins: [1])
• 5 x Analog 3.3V inputs with 2 of them low pass filtered
• (Optional) 2x RS232/RS422/RS485/3.3TLL serial ports for connecting virtually any serial device (if using xbee: then 1 port)
• (Optional) Onboard (optional) Xbee Modem
• 8 x PWM outputs on standard 1/10th inch headers
• 1 x R/C receiver PPM frame input
• 1 x SPI bus
• 1 x I²C bus
• 1 x USB (client) with either onboard mini-usb AND/OR remotely located USB Plug
• 2x 3.3v / 1A linear regulator for Processor and for XBee modem separated for safety
• 1 x status LEDs
• 80.0 x 40.0mm
• 23 grams including 2.4GHz Xbee Pro, all 100mil headers, usb connector, 2.5Amp 5V DCDC and serial converter
• 1 power switch with current limiter
• 2 layers PCB design, 0603 components
• (Optional) onboard 5v / 2.25A switching power supply (input voltage range 6.1v → 18v)
• 3 power options using a jumper/bridge to connect the servo power rail to the autopilot 5V power rail:

1. In the case of few very low power servo's: you power your servo's from the autopilot power (not recommended: in any case check to make sure all servo's together never ever use more than 1.5 amp even when blocked)
2. In the case of a high quality external BEC: you can omit the onboard regulator and power everything from the BEC.
3. Otherwise: separated onboard autopilot 5V power and externally supplied servo power

Architecture

Files

Media:Yapa_gerber.zip

Problems Comments Ordering Change Requests Etc

cdewagter