TimLee
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TimLee 21/04/2022
Seems to work as expected. A neat & tidy unit with a bright clear display. The description above is misleading though, the accuracy in the documentation is listed as +/- 50 ppm +/- 5%. A device for the claimed 1ppm accuracy might perhaps start at 100x the cost and need reference calibration. There are published sources for recent atmospheric CO2 levels to compare with if you can get this into a space with clean fresh uncontaminated air, such as https://www.csiro.au/en/research/natural-environment/atmosphere/latest-greenhouse-gas-data/ I've found that you need to be reasonably far away from it to not have your breath affecting it so it does seem to do a reasonable job of CO2 reporting - for a cheap device anyhow. For noting if there's a problem with indoor air currently, this will be useful. Arrived in 4 weeks which is about normal currently.
3 в 1 Цифровой CO2-метр Счетчик углекислого газа Монитор качества воздуха Температура Влажность Анализатор воздуха для дома и офиса
US$24.99 US$28.99
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TimLee Itwould only fulfill everything I need if it had current measurement.

FromHeaven 13/08/2021
En una palabra, MUY BUENO. Para el precio que tiene, es una verdadera herramienta que cumple todo lo que necesitas, el tema de las baterías te salva cuando ya se te acaba la energía y solo cambias de baterías (y no tienes que esperar a que se cargue la batería), los protectores de los conectores y también la bolsa de transporte es otro punto a favor. Punto en contra, que los cables no se puedan sacar.
8138 Цифровой сенсорный экран Мультиметр Интеллектуальное цифровое сканирование на 6000 отсчетов Мультиметр Измерение постоянного и пере
US$26.99 US$32.99
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TimLee 23/11/2021
Not compliant with the description. The description says "it is perfect to mount cameras or LCD monitors on a microphone stand." but the 5/8" thread is not the thread found on microphone stands, it's a much coarser thread as you might find on a 5/8" bolt. I should have looked more closely at the pictures where this can be seen. This is of no use to me.
5/8 дюйма Женский штатив-редуктор 1/4 дюйма Мужской адаптер для камеры
US$7.99 US$9.99
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TimLee 17/06/2021
I'd ordered two, when they arrived one appeared dead, didn't turn on, connected to charge it did not show the charging lights. I left it on charge for a few hours & it came good. Perhaps it got squashed in transit & turned on in the box? The long distance light is very good. The wide angle lights aren't that different to the narrow beam, but gives a reasonably good working light. Obviously it's a fairly substantial device, you definitely know you're wearing it, but it's not uncomfortable. As with all devices like this I do wish there was a way to turn it off without having to go through all the modes, particularly flashing.
Бикайт 4-режимный 8*XPG светодиодный фонарь для головы, заряжаемый через USB, с дальним действием, для кемпинга, рыбалки, водонепроницаемый фонарик для головы.
US$16.99 US$28.99
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TimLee "Isthis even genuine Wemos?" The centre of the board appears to be a genuine WeMos module, soldered on to a secondary board with all the battery, display electronics etc.

Chris 13/02/2018
The design for this makes no sense. They put a 5-way directional button on the board, which is great, except "Right" is wired to RESET! So not only do you not get to use the right direction, but you also may accidentally reset the board while using it. I haven't tried the battery charging, because the advice that the board may overheat if your charger is too powerful (!) is scary. That's really a horrible thing to combine with 18650 batteries. We need a schematic. Is this even genuine Wemos? It seems like a counterfeit, it's not listed on their site. I love the idea, but it needs a revision.
Wemos® D1 Материнские платы Esp-Wroom-02 ESP8266 Модуль мини-WiFi NodeMCU
US$12.95 US$15.54
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TimLee Afterupdating with CP210x driver, the USB connection does work. It's not necessary to use an external USB to serial, but it does use a different one to the usual Wemos D1.

AllenCK 30/05/2018
As I have found with several similar Wemos units, the USB connection does not provide a comm port. In order to flash the unit, one must connect an external USB to serial converter. On this unit, TX is labeled D10 and RX is D9. To flash the unit, turn the unit on while holding the joystick button to the Left. The serial port wii then report (at 74880 baud): ets Jan 8 2013,rst cause:2, boot mode:(1,6) When you are in flash mode, you can save the current app: allen@laptop3:~/ssd1306$ esptool.py --port /dev/ttyUSB0 --baud 74880 read_flash 0 0x100000 ESP8266_18650_Battery_0.96.bin esptool.py v2.3.1 Connecting.... Detecting chip type... ESP8266 Chip is ESP8266EX Features: WiFi Uploading stub... Running stub... Stub running... 1048576 (100 %) 1048576 (100 %) Read 1048576 bytes at 0x0 in 143.2 seconds (58.6 kbit/s)... Hard resetting via RTS pin...
Wemos® D1 Материнские платы Esp-Wroom-02 ESP8266 Модуль мини-WiFi NodeMCU
US$12.95 US$15.54
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TimLee I'vefound no additional USB to serial converter required, just USB direct from the PC to this board. It has USB client built in. i did need to update with CP210x driver, it's different to the actual Wemos D1 boards.

RoyAnderson 09/10/2018
Like others I struggled to find documentation on how to get this up and running. It's running now, and I'm providing some info that may be helpful to others. To Upload to WEMOS 8266 with a FTDI232RL USB To Serial convertor - There probably are other Arduino IDE settings that work, but I've set Arduino Board to Wemos D1 R1, Baud Rate to 115,200. Set COMM Port to whatever is appropriate for your system, then use the standard Compile and Upload buttons (note the Programmer setting is not used). - Physical connections from FTD232RL to Wemos are : TX to D9 (RX), RX to D10 (TX), GND to GND, VCC to 3V3, and FTD232 D3 (GPIO0) to FTD232 GND (required to put WeMOS in flash rather than run mode for boot, remove after download complete. You can leave the other connections and the FTD232 connected so you can monitor serial traffic while running). Note FTD232 CTS and DTR are not needed, also no need for pull up/down resistors, nor a need to push any buttons to reset or start download (but remember D0 to GND during download) Favorite sample doc as referenced in another post. This is a mod to the original that adds weather display but shows example for buttons, display and web server. https://www.esp8266.com/viewtopic.php?f=8&t=17740&p=0&e=0&sid=1bad0a8857210af752c18e769bacaa08
Wemos® D1 Материнские платы Esp-Wroom-02 ESP8266 Модуль мини-WiFi NodeMCU
US$12.95 US$15.54
2
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TimLee Whilei'm not sure who is manufacturing the Banggood supplies, the design seems to come from VNG systems https://www.vngsystems.nl/Arduino-elektronica/ESP8266/d1-ESP-WROOM-02-Wemos

Kevin 18/04/2018
This looks like an interesting configuration. No docs for it exist on WeMos site so I'm not sure who manufactures it. Time to play.
Wemos® D1 Материнские платы Esp-Wroom-02 ESP8266 Модуль мини-WiFi NodeMCU
US$12.95 US$15.54
0
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Wemos® D1 Материнские платы Esp-Wroom-02 ESP8266 Модуль мини-WiFi NodeMCU
US$12.95 US$15.54

Q: The specification say Supply Voltage 5-12V. Where can you connect this 12V source?

Задавает TimLee на 2019-03-21 06:48:54

Djninjac It is recommend 5V power supply

2019-04-04 01:24:51 полезный (0)
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