If you've got a PDB with dedicated pins for Cam, Video, and OSD, you can use a really simplified wiring setup for your Micro MinimOSD. This is how I did it with my Demon Core V2.3.
(Part of the wiring diagram below is courtesy of kuerva at: http://www.xtremefpv.net/foro/viewtopic.php?t=308 . I added the FC with connections and I am using a different cam and vtx than shown.)
![[Image: lupftLly0zJDM7jvv8w2p4tpKAJCM0EDORDHjzPf...3-h1082-no]](https://lh3.googleusercontent.com/lupftLly0zJDM7jvv8w2p4tpKAJCM0EDORDHjzPfTcMr9h2futzec_zp6x03bcW0W8lN9n8NxJ6sug=w1223-h1082-no)
With the Demon Core 2.3 PDB, this setup works great! It has the required connections for Cam, VTx, and OSD, and all power outputs are selectable as 5 or 12 volts, and filtered. Following the rule-of-thumb: "1 ground per component", the MMOSD requires only 6 wires. The four supplied from the PDB, and Rx, Tx from the FC.
Tip 1: If your PDB has filtered power/ground connections for the OSD, use them - but get Vbat readings from the FC if possible. This keeps wiring to a minimum on the OSD (see diagram above). On my build, I supplied battery power to Vbat on the FC (Flip32), and set MWOSD to "Use FC main voltage".
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Because I wanted to be able to easily remove the MMOSD for programming or replacement, I soldered a pigtail with Male pins to Vid In/Out on the OSD, and Female plugs directly to Vid In/Out on the PDB. You could change the gender on these (or even "key" them), but I already had a strip of 3 plugs on the PDB for vtx, and Vid In/Out were next in line, so I just used a strip of 5 plugs.
Tip 2: Use a pigtail to connect Vid In/Out for easy removal. You could place plugs or pins on the OSD itself instead, but by soldering the Vid wires to the OSD (using plugs/pins on the PDB), it makes it easier to put heat-shrink around all of the OSD except the edge with the 5-pin header (see next tip).
![[Image: IKRA2BKUaZ3ygfJn93aw6r0hchV_wbEVXbm7HNeb...40-h979-no]](https://lh3.googleusercontent.com/IKRA2BKUaZ3ygfJn93aw6r0hchV_wbEVXbm7HNebh2BznRWRSRjt57mJwuK1pT_tyV_SBinoDCd6kA=w1740-h979-no)
Now, I knew I would need to flash the MMOSD and do initial configuration before first use, so I needed to install pins to connect to the FTDI programmer. Fortunately, 4 of the 5 pins needed could also be used for the connections to the PDB. I just needed one additional pin/plug for DTR from the programmer. Since I don't like to accidentally connect things wrong, I "keyed" the pin header by using Males for Tx, Rx, +5v, and Ground - and a Female for DTR. On the FTDI, I used opposite, mating pins/plugs.
Tip (and Trick) 3: Intall a (keyed optional) 5-pin header on the OSD and use +5v and Ground in that header for the power connection from the PDB (see wiring diagram). You don't need to use any of the other grounds on the OSD. I originally installed a pin on the end ground (on left in first photo), but later cut it off because it was not needed and in the way.
![[Image: 6DSbcbzs-icXM9l5xSjNyI6kRTfg_bh81oHcW_gX...40-h979-no]](https://lh3.googleusercontent.com/6DSbcbzs-icXM9l5xSjNyI6kRTfg_bh81oHcW_gXbaZvqI4sKGjzEbRuRjz3v1-gxV96i16-vszLJg=w1740-h979-no)
![[Image: NjFkXuoYheP09k8459OoQzZAZANjTXYFavKI0N0p...40-h979-no]](https://lh3.googleusercontent.com/NjFkXuoYheP09k8459OoQzZAZANjTXYFavKI0N0pj0egenMAIX8K9sfp21gh6aWlfvZZT3sm_2LqmQ=w1740-h979-no)
![[Image: GK1ttrNXOCBja2GHRetrJ8RWxRYzZZM2fci-Qvnj...40-h979-no]](https://lh3.googleusercontent.com/GK1ttrNXOCBja2GHRetrJ8RWxRYzZZM2fci-QvnjE_yY83kUz1KPyvrcHqtZhL2wfd5mIfNbmfAMkA=w1740-h979-no)
![[Image: WNcTKH2lZHSxpPyLY-bEPuRoY1E8vb-T4FPkIxRc...40-h979-no]](https://lh3.googleusercontent.com/WNcTKH2lZHSxpPyLY-bEPuRoY1E8vb-T4FPkIxRcgB6oKiNaR_imtaw0fQP2QhKdeNKN6u8PUu8YEQ=w1740-h979-no)
![[Image: jivQMVWTXY2tBE9r2Yi5QZLDLHZAunDm2F-CVoCQ...40-h979-no]](https://lh3.googleusercontent.com/jivQMVWTXY2tBE9r2Yi5QZLDLHZAunDm2F-CVoCQaaE5YOxanXvwwadweT4izHVf0NZhv4nGi6J-Ug=w1740-h979-no)
The next tip is not really specific to OSD wiring but should be followed when wiring in general. Take care not to create a situation where you can easily short live pins together.
Safety Tip 4: When using pins and plugs where power is involved, use Female plugs for "live" power headers or pigtails. I used Female header plugs soldered directly to the PDB for the vtx connection (mainly for ease of servicing). I soldered the camera pigtail directly to the PDB, and soldered a pigtail with Female plugs to +5v and ground on the PDB to supply power/ground for the OSD. In the photo below, near the top is the row for OSD, VTx, and Cam connections. From left to right: +5v and ground for OSD direct soldered (note - plugs not yet installed on ends), Vid in/out plugs for OSD, then 3 plugs for VTx (+12v in center), then direct soldered pigtail for Camera. Also notice the single pigtail (female plug) right below that for powering the FC.
![[Image: zRWrguxv6-SnZ6dp7P1FUiswWQz3XDba1Yf5LYUN...40-h979-no]](https://lh3.googleusercontent.com/zRWrguxv6-SnZ6dp7P1FUiswWQz3XDba1Yf5LYUNR_DcO62mG_nnP7cvZNccltLtxX1LcZ57ZH-R1Q=w1740-h979-no)
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On the Flip32, the Tx/Rx for OSD shares the UART for USB. When OSD Tx/Rx is active you can't use the USB. I originally thought that the placement of my OSD would make it easy to "unplug" so that I could program the FC, but that turned out not to be the case. So I added a "switch" in the Tx line from the OSD (see wiring diagram). I couldn't find an actual small switch, so I made a jumper instead. I sprung the pins a bit to help the jumper stay snug, but if it does happen to fly off during flight, the video stream from the camera is not interrupted (and I have extra jumpers).
Trick (and Tip) 5: Put a switch in the OSD Tx line (see wiring diagram). A micro slider switch would be ideal, but if you haven't got one, make a jumper (and make an extra to keep in your flight kit). The photos below show mine (as well as the placement of the MMOSD in this tiny 130 size frame). [The "switch" pin header is secured to the FC with epoxy.]
![[Image: GOc28dG6bjJxZDSAHxZE4Z-wuAy541DuGvGhLV40...40-h979-no]](https://lh3.googleusercontent.com/GOc28dG6bjJxZDSAHxZE4Z-wuAy541DuGvGhLV40haVplKAVaPG23ZMdLKzJOOGDCOcu4sJSkMtV5Q=w1740-h979-no)
![[Image: HRKJVLv-VFV2Oawru9G9iQlFcLwJVe85NKP1dDnj...40-h979-no]](https://lh3.googleusercontent.com/HRKJVLv-VFV2Oawru9G9iQlFcLwJVe85NKP1dDnjwLSG-lTn7ILMQbp7QSmAUswBIFhOoaRNO3utEQ=w1740-h979-no)
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Good luck with your Micro MinimOSD wiring setup!
Scotty
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