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Old Jan 25, 2012, 02:04 PM
caall99 is offline
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Power-line attraction pilot
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why is my RSSI working without anything then?

for the last week the voltage range of 1.5 to 3 volts have clearly indicated signal strength. did i just get lucky? after calibration, my osd shows near 0% RSSI when transmitter is in microwave and 100% when next to the receiver. If i stand in between the two is dips to somewhere to 70-80%.
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Old Jan 25, 2012, 10:02 PM
Seppos is offline
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Good question, not sure how it works ! - maybe it is lowpass filtered a lot before it gets to the OSD?, maybe it samples fast enough and does max/min holding?
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Old Jul 09, 2012, 08:38 AM
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i connected my 9x rx to the cyclopes osd unit and i get 1.7 when in best signal and 0.8 when rc link tx is turned off.

i guess it correspondence to what others had come out with.

thank you for the info
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Old Aug 05, 2012, 11:12 AM
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Quote:
Originally Posted by guy1a View Post
i connected my 9x rx to the cyclopes osd unit and i get 1.7 when in best signal and 0.8 when rc link tx is turned off.

i guess it correspondence to what others had come out with.

thank you for the info
Why not adding a LM358 to create a Voltage Follower / Buffer? Don't forget that when you connect the RSSI you take power that can false the data.
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Old Feb 20, 2015, 05:37 PM
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I guess this is pretty much a lost cause getting RSSI from the cheap radio.

Out of curiosity I did probe with multimeter, same results as majority of post here.

The one that posted had it working must be one fortunate soul.
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Old Mar 03, 2015, 07:30 AM
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I guess not all hope is lost. A negative peak-hold circuit would correct the pin1 waveform. I designed and simulated a very simple one: http://www.partsim.com/simulator/#28397

When the RSSI portion of the input signal is at 0.02V, the circuit outputs 2.6V. When the RSSI portion increases to 0.75V (almost no signal), the output drops to 1.6V. When the RSSI is around 0.85V (signal lost), the output further drops to 1.55V.

The output values are well within 0-3.3V, so can be used with 3.3 and 5V ADCs. I intend to make this circuit and test it on a FlySky R6B receiver (A7105 rf chip), and I'll post the results.

Here is the schematic, in case partsim.com website changes or will be unavailable in the future. The voltage source simulates the input voltage from pin 1 (RSSI). Output signal is measured across R3.

Name: neg-peak-detector.png
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Description: The voltage source simulates the input voltage from pin 1 (RSSI). Output signal is measured across R3.
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Last edited by smar2; Mar 03, 2015 at 08:04 AM. Reason: more details added
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