Willkommen, Gast
Benutzername: Passwort: Angemeldet bleiben:

THEMA:

Jeti Altmeter for less than 5€? 13 Dez 2016 21:28 #1

  • TeroS
  • TeroSs Avatar Autor
  • Offline
  • Platinum Boarder
  • Platinum Boarder
  • RC-Thoughts
  • Beiträge: 527
  • Dank erhalten: 370
Folgende Benutzer bedankten sich: BOE, skyfreak

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Jeti Altmeter for less than 5€? 13 Dez 2016 21:46 #2

  • skyfreak
  • skyfreaks Avatar
  • Offline
  • Platinum Boarder
  • Platinum Boarder
  • Beiträge: 2946
  • Dank erhalten: 1445
nice one, thanks.
actually I have some real-life-case-questions on your little altimeter please.
could be a nice tiny solution for F3K/DLG.

the price of cause is the burner :D compared to ANY other solution, be it jeti or eg sm-sensors.

what about the scale of the height.
would decimals be possible or only full meters?

as you know for F3K size and weight matters a lot!
sizes I guess I could get from the arduino specs and estimate from your pics compared the RX (not really super xxs ;)), but could you tell us what it weighs please?!

and last not least again on size ... do you see any chance to make it smaller?

rgds, GUIDO
Fliegergruss
GUIDO



_________________________________________________________
Too many dicks on the dance floor.
Too many dicks!​


Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Jeti Altmeter for less than 5€? 13 Dez 2016 22:31 #3

  • TeroS
  • TeroSs Avatar Autor
  • Offline
  • Platinum Boarder
  • Platinum Boarder
  • RC-Thoughts
  • Beiträge: 527
  • Dank erhalten: 370
Decimal is possible, but since the altitude-measurement is based on pressure my opinion is that it's not that useful. But possible, yes.

Proto is 6.7 grams with ~10cm 22AWG servocable, and weight was not in mind when I made it:



As for making it smaller, well anything is possible. But not for free and size-advantage is not that big.

One possibility is Tinyduino tinycircuits.com/collections/all but a) a lot of wiring necessary + size advantage is really small. (Arduino Pro Mini is 18x33mm, Tinyduino is 20x20...)

Arduino Pro Mini has voltage regulation on board, no extra compinents needed by user to get the sensor to use 2S RX-voltage.

So the only solution is custom PCB with SMD-components. And obviously a) it's not DIY anymore and b) it's not 5€ anymore.

I have plans on making a custom Arduino for different Jeti-sensors but the Arduino size-advantage is not that big, it's more for the convenience and to get the overall size smaller (thickness of 2 PCB's)

One way could be different processor, might be doable with attiny for example but then we are again on the path for custom code, custom pcb, custom everything and then it also gives custom cost...

There is no possible economical possibility for me to make a smaller, commercial unit. I could make the development, PCB etc and get them fabricated but the money is simply not there. Making something with 0402 SMD-components makes the unit small but no way I could make them at home, they would need to get bought ready made and then the prize is totally different. I love the hobby but I'm not making 100 custom-units for the cost of ~1000 to 1500€ and try to sell them for ~175€ a piece. (Which I'd have to for even breaking even after all taxes). I'd be left with 99 units for years to come.

After all, it's a 5€ DIY-unit, there's gotta be a reason for why it's 5€ :)
Folgende Benutzer bedankten sich: sunbeam

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Letzte Änderung: von TeroS.

Jeti Altmeter for less than 5€? 06 Jan 2017 23:50 #4

  • TeroS
  • TeroSs Avatar Autor
  • Offline
  • Platinum Boarder
  • Platinum Boarder
  • RC-Thoughts
  • Beiträge: 527
  • Dank erhalten: 370
Have you ever thought how cheap DIY-sensors perform compared to the "real thing"?

No more guessing, here's how 5€ Jeti Altmeter compares to Jeti MVario2: www.rc-thoughts.com/2017/01/performance-...hts-altitude-sensor/

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Jeti Altmeter for less than 5€? 07 Jan 2017 11:08 #5

  • onki
  • onkis Avatar
  • Offline
  • Platinum Boarder
  • Platinum Boarder
  • Beiträge: 2286
  • Dank erhalten: 790
Hi Tero,

I really like your projects. They show how easy it is to get a small sensor done with a few components only.
I started with a current sensor using a Teensy 3.2 and I really love this module as it offers more than one UART in oder to have a serial port for debugging. This is really helpful when you start working with this stuff and have no idea about what is going on (sending ADC result code through serial line to get the calculation done properly).
But the Teensy is a quite expensive device. This is why I switched to the ProMini but this just has a single UART which is a big disadvantage. I am not sure if the 32U4 can do better but AFAIK this also has a single UART. Softserial seems to difficult and it is not supported by the great Jeti telemetry library supported here in the forum.

I like the idea of an additional sensor board. The form factor could be the same than the ProMini (piggyback). If a current sensor, a temp sensor and a pressure sensor (and maybe other useful stuff) could be fitted there a modular sensor board could be managed. The code could be managed modular as well by just activating the units used by the board.
Coming back to current sensors. Since I also use ADCs in my work I hatre the fact of converting a signal several times. In case of a hall sensor a voltage signal is provides which will be converted to a digit again by using the built in 8/10bit ADC. This is completely mad. I would love the idea of having a hall current sensor using SP, I2C etc. to transfer the signal. But I havent found anything yet. Or a powerful 12 bit ADC with I2C etc on this board to allow on board conversion. I think this is the better solution than using the poor ATMega ADCs.

What do you think about that?

Best regards
Onki
Gruß aus dem Nordschwarzwald
Rainer aka Onki
www.onki.de
gepostet unter Verwendung von 100% recycelter Elektronen.

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Jeti Altmeter for less than 5€? 07 Jan 2017 11:29 #6

  • TeroS
  • TeroSs Avatar Autor
  • Offline
  • Platinum Boarder
  • Platinum Boarder
  • RC-Thoughts
  • Beiträge: 527
  • Dank erhalten: 370
I think you're on track :)

There are few reasons why I'm on Arduino Pro Mini's at the moment, one is the fact that I know nothing about programming, second is the price. So far my interest is in DIY-stuff users can make themselves for very little money and keeping the need for any programmers etc to a minimum.

I have thought about teensy, Attiny, S32 also but then again in practice all these would need a PCB and then we are out of "cheap DIY" immediately. I have thought about making the PCB's (RFID-sensor is coming to shop next week hopefully, it has a PCB of my design between RFID-board and Arduino) but there's really no point for me to sell just a PCB or DIY-kit, Finnish postal cost takes care of that. (Buy stuff for 4€ and pay ~20€ for shipment is insane)

One thing I have in mind is a custom PCB with Atmega 328P, quite many advantages, easy programming with Arduino IDE, if talking for example about RFID-sensor the current thickness of 8mm could be down to ~5mm. Designing that PCB is easy and they do not cost that much to make but solerding the Atmega on the board with SMD-parts would be a bitch. Then again, getting them as ready from Asia would need so big order that I cannot afford that, and who knows if they will sell. But that "one PCB" would be cool, little effort into designing one could get altitude-sensor on there really easy.

One idea I really would like to try is a one-PCB solution for RFID, but the need for money and labor keeps that back. Iäm making my LogicSwitches myself with SMD-components and that is something I really do not love. Making a one-PCB solution for RFID would mean a lot more components, and that would drive me insane and the selling-price vs. labor-time just isn't there.

But DIY with Arduino, it's cheap, it's fun :)

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Ladezeit der Seite: 0.240 Sekunden
Powered by Kunena Forum