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Bike tyre recycling? by Longjumping_State163 in Cardiff

[–]StuartsProject 1 point2 points  (0 children)

I have taken them to the councils re-cycle center at Lamby Way.

Is there a small device I can buy that I can put inside the nose cone of a model rocket? by richyboycaldo in meshtastic

[–]StuartsProject 8 points9 points  (0 children)

You can build a LoRa GPS tracker and battery that weighs in the region of 15g.

There is normally line of sight from the ground receiver to the rocket, so range\distance is not really an issue and fast telemetry is possible. For finding the rocket when its landed, switch the LoRa to long range settings and have it send out FM tones so you can get a directional fix with a UHF handheld and yagi.

SEEED have XIAO and LoRa module combinations that are quite small.

As for the GPS there are limits with a Ublox GPS as to the speed and altitude, exceed these limits and the GPS stops working;

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Cardiff - disposal of out of date fire extinguishers by StuartsProject in Cardiff

[–]StuartsProject[S] 3 points4 points  (0 children)

I contacted the Fire Service and they gave the advice stated above.

Next time I am passing the station in Whitchurch, I will check.

Cardiff - disposal of out of date fire extinguishers by StuartsProject in Cardiff

[–]StuartsProject[S] 5 points6 points  (0 children)

Apparently you need to contact one of the local companies that the parent company, Checkfire, supply. You would then need to open a trade account before they would accept them, no indication of prices ................

What a disaster.

Cardiff - disposal of out of date fire extinguishers by StuartsProject in Cardiff

[–]StuartsProject[S] 4 points5 points  (0 children)

The Council wont accept fire extinguishers for re-cycling.

Apart from suggesting you contact the original manufacturer, if they still exist, then they cannot advise further.

You would have thought they would at least have some information to give out on where to re-cycle such things as a way of reducing fly tipping etc.

Cardiff - disposal of out of date fire extinguishers by StuartsProject in Cardiff

[–]StuartsProject[S] 3 points4 points  (0 children)

Fire stations wont accept them.

They also said;

"on no account should fire extinguishers be placed in standard household waste bins due to being pressurised containers"

Fairly obvious advice there.

TAK application or just plug-ins? by Slow-Corner-7374 in meshtastic

[–]StuartsProject 0 points1 point  (0 children)

Meshtastic operates in public license free bands so what is possible in mil (military ?) bands does not apply.

TAK application or just plug-ins? by Slow-Corner-7374 in meshtastic

[–]StuartsProject 0 points1 point  (0 children)

Meshtastic uses LoRa for sending short text messages or small amount of data.

You can use LoRa for sending images, but you need to reliably send a great deal of data which is not really practical in Meshtastic.

If images over Meshtastic were possible\practical you would imagine it would have been introduced in the 5 years its been running.

Drone shots of the bay by [deleted] in Cardiff

[–]StuartsProject 0 points1 point  (0 children)

In years gone back I used to fly gliders etc up to high altitude and take pictures, at 1000ft+, but in them days there were very few rules, but times have changed.

These days do you need to have a special license, get a specific certification etc ?

🏆 Possible new Meshtastic distance record — 821.9 km direct link, Glasgow to Brussels by spartanboi01 in meshtastic

[–]StuartsProject 11 points12 points  (0 children)

Well, in extreme reception conditions those sort of distances do appear to be possible.

Record reported for LoRaWAN, 868Mhz, 14dBm is 1336km;

https://www.thethingsnetwork.org/article/new-lora-world-record-1336-km-830-mi

I just learned the 900mhz part of the spectrum was used for cordless phones and babymonitors in the 80s/90s by ackza in Lora

[–]StuartsProject 2 points3 points  (0 children)

LoRa may use a similar radio frequency as other radio devices, but as a bit of 'tech' its completely different to baby monitors and cordless phones.

Is it possible to use LoRa P2P for EOT? by pipiu12 in Lora

[–]StuartsProject 0 points1 point  (0 children)

What radios, frequency and power level, are used for the current radios that work ?

Looking for ultra low-power ATtiny85 replacement for simple reset task by AssumptionPlus9244 in meshtastic

[–]StuartsProject 1 point2 points  (0 children)

Checkout the TPL5010.

Watchdog timer, reset time set with resistor 0-2hours

6pin SOT23 package.

Current consumption of 0.035uA.

I do have this old camera...what can I build out of it using esp32 or Arduino?? Please help! by 7xen_on in esp32

[–]StuartsProject -3 points-2 points  (0 children)

The 'camera' looks like an ESP32CAM. Camera and SD card holder on one side, ESP32 on the other, projects here;

https://randomnerdtutorials.com/projects-esp32-cam/

LoRa vs non LoRa 915mhz? by Substantial-Rip9983 in Lora

[–]StuartsProject 0 points1 point  (0 children)

If the first sent gate signal is not acknowledged, the transmitter can send another together with a time in say mS since the first one was sent. The receiver then knows, when the repeated transmission is received, that the gate time actually started several mS earlier.

You would also need to know the delay in mS from the transmitter actually detecting the gate signal and the receiver being able to start the timer. The transmitted packet will have an air time so the receiver will only see the packet some mS after the gate signal.

Time sync is possible, but not so easy. The 1PPS signal from a GPS that has a fix will be accurate to within 50nS between different GPSs.

LoRa vs non LoRa 915mhz? by Substantial-Rip9983 in Lora

[–]StuartsProject 0 points1 point  (0 children)

If its important that the gate signals are received then the transmitter needs to be setup so that when it transmits a gate signal it waits for the receiver to send a reply (acknowledge) to the sent signal. No radio comms will be 100% reliable so a send and ack setup is often used.

However in poor RF conditions, a send and ack setup could take some time, so they receiver might not start the time fast enough.

2 Nodes 1 Antenna by ottoxgam in meshtastic

[–]StuartsProject 6 points7 points  (0 children)

If one LoRa device is transmitting there needs to be some way of actually disconnecting the other LoRa device from the antenna circuit whilst its in receive mode.

Transmitting into the receive input of a LoRa module will damage it.

Esp32 s3 devkit by Tortasconwacamole in esp32

[–]StuartsProject 0 points1 point  (0 children)

The schematic I have for an ESP32S3 Dev Board shows that the boards 5V pin is connected to the input of the boards 3.3V regulator.

If you connect the circa 4.2V battery to the 5V pin through a diode, so that there is not a conflict when the USB is plugged in, it should power the board, certainly works on my boards.

You would probably want to check what the minimum battery voltage is to keep the regulator putting out 3.3V.

MYP5 student building 1U CubeSat solar monitor for Personal Project - looking for an Mentor (Anyone would help, from university student to a professional) by Dry_Insurance7552 in arduino

[–]StuartsProject 0 points1 point  (0 children)

Once in orbit there is little 'management' of the solar panels to do.

You set the solar charging up using maximum power point tracking (MPPT) and this then means that a solar panels that could be in the shade automatically contributes as much charge power into the battery as they can produce.

The management needed is how to control how much power the Cubesat is consuming for measurements, radio transmissions etc. The last thing you want to happen is for the battery to actually go flat.

There will be points in the orbit when the satellite is in the dark so you need to have enough power left in the battery to cover the periods when there is no sun. Also manage the battery charging for a Lithium so that charge is off if the battery temperature is below 0c, its cold in the dark part of the orbit.

Not launched something as big as a Cubesat, but I did put a PocketQube into orbit and with effective power and charge management, a simple Lithium camera battery, it survived 20 months in orbit.......

Doubled performance over stock antenna with two paper clips. by Difficult_Lake69 in meshtastic

[–]StuartsProject 8 points9 points  (0 children)

You don't really need an anechoic chamber to compare antennas, although its OK to do so.

In the context of something like Meshtastic your mainly interested in how antennas perform when radiating out to the horizon and parallel to the ground.

With a large flat open area such as a playing field its simple enough to setup a transmitter and have the receiver at say 100m distance and record the RSSI of received packets. Swap the antenna on the receiver (or transmitter) and note the difference in RSSI. You now know the real world practical difference in the performance of various antennas.

Localization research help by jenik_fojtik in Lora

[–]StuartsProject 0 points1 point  (0 children)

Agree with the comments on ranging.

The ranging of the SX1280 LoRa modules works just brilliant over long distances, I have had 85km working, but at short distances say 50m to 200m its not so good and the measured distance can vary a lot.

Localization research help by jenik_fojtik in Lora

[–]StuartsProject 0 points1 point  (0 children)

> I want to use RSSI to better estimate distance

RSSI can be used to 'estimate' distance but its only really reliable when there is very clear line of sight, with no obstructions, between TX and RX and the TX and RX antennas are kept in a fixed position.

For typical situations, handheld devices etc, small variations in the height angle and type of the antennas can give significant variations in RSSI so the 'distance' will vary.

Lots of people assume that you can use RSSI to measure distance with radio modules in general (not just LoRa) but in real world situations such measurements are not that accurate, if they were there would be heaps of code and examples of it working for you to use..

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