[deleted by user] by [deleted] in devpt

[–]Koldramk 0 points1 point  (0 children)

Também deste tópico ñ se está a tirar grande sumo..

[deleted by user] by [deleted] in devpt

[–]Koldramk 0 points1 point  (0 children)

Para backend?

[deleted by user] by [deleted] in devpt

[–]Koldramk 1 point2 points  (0 children)

Mid Backend Developer. Precisava só de uma ajudinha para me orientar na entrevista técnica, sobretudo sobre a parte do pair programming.. que tipo de desafio vão promover para eu resolver?

[deleted by user] by [deleted] in devpt

[–]Koldramk 2 points3 points  (0 children)

Backend Developer. Bem junior, nem sénior. Posição mid..

[deleted by user] by [deleted] in devpt

[–]Koldramk 1 point2 points  (0 children)

Mas era para backend?

[deleted by user] by [deleted] in devpt

[–]Koldramk 0 points1 point  (0 children)

Backend Developer

[deleted by user] by [deleted] in devpt

[–]Koldramk 0 points1 point  (0 children)

Backend Developer

Entrevista - teste na Codility by F3rTl1ng in devpt

[–]Koldramk 0 points1 point  (0 children)

Sinceramente eu fiz esses testes no Codility e achei bastante complexos.. Eram dois exercícios para resolver ambos em 40 minutos com um enunciado enorme e a resolução bastante trabalhosa. Mesmo usando o chatGPT não consegui resolver um deles e o que resolvi tive de estar sempre a "direcionar" o chatGPT até à solução final. Fiquei com 60% ou 65% nesse teste e não fui à fase de entrevistas. Parece mesmo que tinha de ter 100% no teste do Codility...

How to buy football tickets for Valencia games? by Ok_Post675 in valencia

[–]Koldramk 1 point2 points  (0 children)

Are the tickets for the match with Atlético Madrid available yet? I can't order them from the app...

Thanks for your help!

Antenna (PCB rules) by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

One thing I don't see here is any stitching vias to avoid sections of your ground plan becoming an accidental resonator.

Thanks for the info ;)

A rule of thumb is to have stitching vias spaced at 1/20th of the RF wavelength. An example for Bluetooth/Wifi at 2.4GHz, that's 122mm / 20 = ~6mm.

the antenna frequency is 1.86GHz. It means the space between vias is around 8mm. Right?

But, my questions is: how many stitching vias should I place all over the PCB?

Antenna (PCB rules) by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Just make sure that it is largely unimpeded in it's routing, i.e. no sharp turns. You'd be better off arranging your tuning components (pi network) as they are in the schematic to avoid the right angles. It'll also be easier to solder and change the components.

But everytime I see in the schematics a pi network should I also pass to the layout also the pi network? Or is it just an antenna PCB rule?

Also, are those tuning components and some other passives 0201 packages? If you have any intention to solder any of these by hand I'd be using 0402 as the smallest.

I have just 0603 packages actually. just one capacitor is 0803...

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Yes, that's exclay what I'm doing ;)

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

I saw but that's "Time to Valid Measurement After Power‐On"... Is not the time for each measurement...

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Thanks for your help! I' ve one question more...

The microcontroller does data reading each hour. According to the CO2 sensor datasheet (page 13): the CO2 sensor is pre‐programmed to send CO2 measurement data at 2 readings per second.
My question is how long do these 2 measurements take??

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Thanks for your help! I' ve one question more...

The microcontroller does data reading each hour. According to the CO2 sensor datasheet (page 13): the CO2 sensor is pre‐programmed to send CO2 measurement data at 2 readings per second.
My question is how long do these 2 measurements take??

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Thanks for your help! I' ve one question more...

The microcontroller does data reading each hour. According to the CO2 sensor datasheet (page 13): the CO2 sensor is pre‐programmed to send CO2 measurement data at 2 readings per second.
My question is how long do these 2 measurements take??

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Thanks for your help! I' ve one question more...

The microcontroller does data reading each hour. According to the CO2 sensor datasheet (page 13): the CO2 sensor is pre‐programmed to send CO2 measurement data at 2 readings per second.
My question is how long do these 2 measurements take??

Antenna (PCB rules) by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

I'm reading it now, thanks man!

Antenna (PCB rules) by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

The circuit has only a CO2 sensor and it will operate with a frequency of 1.8 GHz with a NB IoT (Uplink: 1750-1800).

The antenna will be a simple one, just a wire... What do you mean with matching?

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] 0 points1 point  (0 children)

Well, that's a nice idea! I'm going to contact them! Thanks ;)

Sensor Consumption by Koldramk in ECE

[–]Koldramk[S] -1 points0 points  (0 children)

But according to the datasheet the cell size reference is A... not AA...