kopia lustrzana https://github.com/mikaelnousiainen/RS41ng
Fly with solar panels. What to know
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README.md
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README.md
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### Using two alternating frequencies in HORUS-V2 Mode
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### Using two alternating frequencies in HORUS-V2 Mode
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In Europe there are two areas of RX stations they listen on their regional frequencies. So the problem may occur that you have to decide
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In Europe, there are two areas where the receivers listen on their respective regional frequencies. So the problem can arise that you have to decide
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wich channel you have to choose for best reception reports on the track. So the idea was to define an additional channel to transmit.
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which channel to choose for the best reception reports on the route. So the idea was to define an additional channel for sending.
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You will find in the config.h the entry `RADIO_SI4032_TX_FREQUENCY2_HORUS_V2_ACTIV` on default `false`.
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You can find these two new entries in config.h
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To activate this, set it to `true` and use define `RADIO_SI4032_TX_FREQUENCY2_HORUS_V2` to add a second frequency e.g. `437600000`.
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```
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#define RADIO_SI4032_TX_FREQUENCY2_HORUS_V2_ACTIV false
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#define RADIO_SI4032_TX_FREQUENCY2_HORUS_V2 437600000
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```
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To activate this, set it to `true` and add a second frequency.
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From now on, the frequency will change after each TX Intervall in HORUS-V2 Mode (not working on HORUS-V2-continous-mode).
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From now on, the frequency will change after each TX Intervall in HORUS-V2 Mode (not working on HORUS-V2-continous-mode).
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### Flying solar powered
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#### Rebooting after not reaching a 3D fix
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Sometimes you launch the sonde in an area where GPS cannot be received and then take it to where GPS is available.
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In such cases, it has been found that there is simply no GPS FIX, no matter how long they wait. Then you try a RESTART.
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Most of the time it works then quite fast. This is not a problem if you are still on the ground.
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There are ideas to prepare a RS41 powered by solar panels only. Goal is to fly more then one day don't have this limit with batteries.
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Some addional enhancements are needable to reach this goal. One of them is to make sure after sunrise that there is a GPS fix.
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To solve this its a good idea to make a System Reset in the air if a missing GPS-FIX reaches out some time limit (e.g. 3 minutes or longer).
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The `config.h` shows new entries to activate this improvement.
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```
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// Enable this setting to make a cold start on the CPU if GPS-Fix missing longer then GPS_REBOOT_MISSING_GPS_FIX_SECONDS
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#define GPS_REBOOT_MISSING_GPS_FIX_ENABLE true
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// If enabled above, define threschold how long a missing GPS-Fix before cold start (dont hold it to short)
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#define GPS_REBOOT_MISSING_GPS_FIX_SECONDS 200
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```
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#### Probe does not start at sunrise because current too low
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If solar panels are to be used, it is important to consider a few things:
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- Autostart nessesery. Currently, it is still unclear when the RS41ng software will cause a probe to start on its own when batteries are connected.
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If the batteries are inserted into the existing holder (2 x AA type) the voltage is conducted via a voltage regulator on the board. In this case,
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the button on the board probably works and must be pressed to start the software. This is not helpfull if you wait for pushing a button in the air.
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But there is another method to connect the battery voltage. In this case, the regulator is bypassed. Here the probe starts immediately as soon as at
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least 1.5 volts are present (up to 4 volts are tested). The battery is connected directly to one end of an SMD component.
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I'm sure your community has more info on this.
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- Solar panels should deliver 3-4 volts and a current of 200 mA.
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- You need a capacity of around 2.000 µF to buffer the solar power a little bit. Somehow the RS41 will not start without them.
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Lets have look on the voltage if the sun rises:
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- Its dark, the capacitors are empty.
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- First sun on the panels brings the voltage up to 300 mV. This will load slowly the capacitors.
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- After a while the voltage comes up to 500 mV. The LEDs on the board start to glow and flicker a bit.
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- More and more sun falling on the panels. The voltage climbs to 800-1.000 mV. Over 800 mV the red LED shows that the software starts but...
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- While the voltage is still to low on 800 mV the main procedure on the board tries to init some hardware elements. This is successful
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up to the moment when the GPS module gets initialized. There is a loop programmed and waiting the gps_init will work one day. Not this time.
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- The voltage climbs still in background but the loop will never end. The only way to init the GPS unit successful is to initiate a System Reset.
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- A System Restart is now implemented after waiting 10 times the loop initiated the GPS unit unsuccessfull.
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- If the System is booting meanwhile the voltage is up to get the GPS unit initiated this time.
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- Everything fine now .... But there is no guarantee this way of recovering is the best one - in practice it works.
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## Building the firmware
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## Building the firmware
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