Guess what development board this is?

dcexpert

Guess what development board this is? [Copy link]

 

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I just received a development board today. Can you guess what kind of development board it is? What chip does it use? What are its main functions?

freebsder

The product from Quectel should support something open, either nbiot or 4G.

ljj3166

Cat1, 80% is 4G

An indicator between 4G and NB, said to be quite popular

tinnu

This structure that can be opened is a bit familiar, it seems to be NB or CAT 4G, anyway, it came out after Hezhou. After I bought Hezhou's CAT 4G board, I lost interest in it. By the way, Hezhou's board is still lying here gathering dust. I don't know when I will have time to play with it.

dcexpert

freebsder posted on 2020-10-25 22:23 Quectel should support open or something, either nbiot or 4G.

Quectel is about to release the Bear Pi, which focuses on supporting Python programming.

dcexpert

ljj3166 posted on 2020-10-25 22:45 cat1, 80% is 4G, an indicator between 4G and NB, it is said to be quite popular

It is indeed CAT1, ported to QuecPython (based on micropython).

dcexpert

tinnu posted on 2020-10-25 23:22 This structure that can be opened is a bit familiar. It seems to be NB or CAT 4G. Anyway, it came out after Hezhou. At that time, I voted for Hezhou's CAT 4G board...

The feature of this board is that it supports secondary programming in Python, which makes it much more playable.

btty038

Antennas are for communication.

dcexpert

More photos

littleshrimp

This board looks pretty comfortable.

dcexpert

littleshrimp posted on 2020-10-26 11:04 This board looks very comfortable.

It is said that there are activities, you can try it then

dcexpert

I initially tested the performance using Pi and found it to be similar to the STM32H7.

勇歌灯饰

It looks so small, it should be a good thing

中国罗宾鸟

I soldered four Quectel modules and two of them failed, with a 50% failure rate and a loss of nearly $200! I dare not dismantle it casually, so I plan to find a constant temperature preheating soldering station to take it off and try to see what is broken!

dcexpert

China Robin Bird published on 2020-10-26 21:37 I soldered four Quectel modules and two of them failed, with a failure rate of 50%. The loss was nearly 200 yuan! I dare not disassemble it casually. I am going to find a constant temperature preheating soldering station recently...

How did the soldering fail? For some modules, you can ignore the bottom pads and just connect the surrounding pads.

dcexpert

Yongge Lighting published on 2020-10-26 15:28 It looks so small, it should be a very good thing

In the Quectel module, CAT1 is not too small, but an MCU can be saved.

中国罗宾鸟

dcexpert posted on 2020-10-26 22:58 How did the soldering fail? For some modules, you can ignore the pads at the bottom and just connect the surrounding areas.

I used solder paste and air gun to blow, and only coated the four sides. Since the syringe solder paste I bought didn't have a needle and push rod, maybe I added too much material. It was my first time soldering, so I used the hot air gun to blow for a while and felt no response, so I used the soldering iron directly. Later I found that the communication was not connected, and the second piece was directly short-circuited by the power supply. Most of the time, there is too much solder paste. The pins are shorted. The module may not be broken, so I am trying to find a way to disassemble it and check it. It's more than 100 yuan. The other one can't communicate, is it really broken?

I have soldered before, but I used a soldering iron and tin wire directly. This time, I tried to keep up with the trend and ended up messing it up!

freebsder

dcexpert posted on 2020-10-26 09:17 Quectel is about to release the Bear Pie, with a focus on supporting Python programming.

It’s hard to get the information from the past, and small companies don’t even bother. . .

中国罗宾鸟

freebsder posted on 2020-10-26 23:26 It’s hard to get information from the past, and small companies don’t care at all. . .

Generally, if you buy it through their designated channels, they should give it. I bought it from their Taobao store, and then went to their official website to register an account to download the information, but I still couldn't download it. I need agent qualifications. I didn't care about it later. As a result, they called me the next day and asked me which company I was from. I said I used it myself and bought it from their official Taobao store. Then they asked me to add WeChat and gave me the information I wanted.

Generally when you ask for information, they will ask where you bought your module. This is what happened to me when I called to ask for information. If you can't tell them, they will ignore you.

freebsder

China Robin Bird published on 2020-10-26 23:40 Generally, if you buy it through their designated channels, it should still be given. I bought it from its Taobao store, and then went to its official website to register an account to prepare to download funds...

We didn’t get it from the agent, they ignored us, so we asked other EE users for it... It was a very bad impression.