#speedybee f405 mini FC

35 messages · Page 1 of 1 (latest)

left bluff
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Hi All,
First time FPV builder, I'm wondering if more experienced eyes can spot my problem. I'm building my drone with the Speedybee F405 mini stack and Happymodel EP1 ELRS RX, also using the Radiomaster Pocket TX. The TX and RX appear to bind correctly, but I don't see any evidence in Betaflight that the FC is receiving input from the radio. I have tried UARTS 2, 3, and 6, with the same effect. Prior to buying the ELRS equipment, I tried using a SPEKTRUM TX and AR620 RX I already had, and the result was the same. I can see the bars on the RX page in Betaflight, but they don't move with joystick movement.
I receive 17 sensors on the Telemetry page of my Pocket, and the aural "Telemetry Lost" sounds when I depower the FC.
Does anyone have a suggestion for what I should try next? Thanks!

20241223_134113.jpg 20241223_134023.jpg TX.png RX.png uart.png bars.png config.png setup.png
next pulsar
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Is your rx => tx and tx => rx??

lament valley
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Some of the wires on the receiver side are a little too long and overhanging, possible touching some of the small components. I would remove then wires and cut them a bit shorter like 0.5-1mm then solder them again making sure they don't touch anything else.

next pulsar
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Can I send a pic of your pocket radio

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I’m the sys menu

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When connected

slim bear
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All this and a little more solder since the wires look like they are gonna fray and touch stuff

left bluff
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Thank you for the replies. I have de-soldered all the wires and will clean everything up as PK and Arcticfox suggested. I'll post results later this weekend.

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Watch_Me_GO, yes, I had rx=>tx and tx=>rx. Good question.

next pulsar
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okok soudns good

left bluff
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OK... here's the SYS page. Also, I cleaned up the soldering a bit and connected to UART 6 per Speedybee's recommendation. Still working on the soldering quality...this 20mm board is tough!

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Same result in Betaflight...no TX input.

slim bear
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It’s not connected at all

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The radio should not say 0/250

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At least as far as I know

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Weird

lament valley
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After soldering to R6 T6, did you change the betaflight config to enable "Serial Rx" on UART6 and disable it on UART2?

left bluff
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Yes, I did.

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I have tried all combinations of UARTs multiple times with the same outcome. This is the same with my Spektrum and ELRS receivers. Is a hardware problem very likely? Or maybe I damaged the FC with my soldering and re-soldering?

drowsy briar
solemn domeBOT
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Connect to your transmitter's or receiver's WiFi network to access the web UI:

next pulsar
drowsy briar
next pulsar
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Okok

drowsy briar
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No need to respond if you have nothing to add

left bluff
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YAGPDB.xyz, did I include the screenshots you asked about in my original post?

drowsy briar
left bluff
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This is the receiver.

image.png
drowsy briar
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And show the receiver side wiring

left bluff
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That was it! I saw that the receiver soldering wasn't very good, so I redid it and it works now. Yay!

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I'm not a total soldering novice, but I see I needed to sharpen up my skills to do this kind of close work. I bought some practice boards and that has really helped.