3-ch-diversity-system
3 Channel Automatic FPV Video Selector Diversity System
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| References | Qty | Description | Manufacturer | MPN | Digikey | Mouser | RS | Farnell |
|---|---|---|---|---|---|---|---|---|
| LED1, LED2, LED3 | 3 | SMD LED GREEN 0603 | Broadcom | HSMG-C190 | 516-1425-1-ND | 630HSMGC190 | 450985 | 2497374 |
| 12V, OUT1, OUT2, RX1, RX2, RX3 | 6 | PIN HEADER VERT 2 POS | M20-9990246 | 952-2262-ND | 855M209990246 | 7457065 | 1022247 | |
| C2, C3, C6, C7, C9, C10, C12, C13, C14, C16, C17, C18 | 12 | 100nF 0805 X7R | AVX | 08053C104KAT2A | 311-1140-6-ND | 603CC805KRX7R9BB104 | 6197992 | 3019949 |
| C19 | 1 | 10uF 35V Tantalum 7343 | Vishay | 293D106X0035D2TE3 | 718-1046-6-ND | 74293D106X0035D2TE3 | 1360314 | 2777998 |
| R7, R10, R14 | 3 | 1K 0805 | Yageo | RC0805JR-071KL | 311-1.00KCRCT-ND | 603RC0805FR071KL | 7409063 | 2303550 |
| C1, C5, C11 | 3 | 1nF 0603 X7R | Yageo | CC0603KRX7R9BB102 | 399-1082-6-ND | 603CC603KRX7R9BB102 | 2644551 | 1414608 |
| C20 | 1 | 33uF tantalum 7343 | Vishay | 293D336X9010D2TE3 | 478-4111-1-ND | 74293D336X9016D2TE3 | 6844089 | 1754190 |
This is an Arduino code for a Wemos D1 board (ESP8266 chip), coupled to 3 LM1881 video sync separators, and a MAX4545 video switch. Compared to the popular RSSI-based systems, the advantages a video-based diversity are:
- No need to open the receivers to get the RSSI [Receiver Signal Strength indication] signals. You just have to plug in your different receivers, and they can be of different types.
- There is no need to calibrate the RSSi signals of the different receivers (this is often the tricky part).
- It is also frequent to get a strongly distorted image, while the RSSI is high.
- When the reception level is low (flying far for instance), some receivers have RSSI close to zero, although the image is still viewable. In that case an RSSI-based system is not really efficient.