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fuiru 01/08/2018
I was able to get this working very quickly, but the values coming from the HX711, with no load on the bar, kept drifting very significantly. After a long troubleshooting session, I found out that the HX711 print has a major design flaw. They forgot to connect the AGND pin of the HX711 to GND, so it's just floating in the air, explaining the drifting. This can be fixed by soldering a wire between the GND pin on one connector and the E- pin on the other side. I found the exact same board on a different site with a picture of the schematics. This confirms that AGND is not connected to GND. See attached picture. It's also important to note that the print is designed to be supplied with 5V, even though the HX711 is specified to work down to 2.6V. The internal voltage regulator on the HX711 is configured with R12 and R13 to produce 4.2V across the sensor (E+ and E-). Considering the drop across the transistor, the supply voltage needs to be about 4.5V (or up to 5.5V), otherwise the regulator can't do its job. If a 3.3V supply is provided, the resistors can be changed accordingly. If you use it as is on 3.3V, be aware that the built-in regulator will not be able to do its job, so any ripple on the supply voltage will influence the measurement.
Módulo HX711 + Sensor de carga de célula de pesagem em liga de alumínio de 20kg
US$6.99 US$13.99
10
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fuiru Thanksfor the detailed comment! I had not realized that the connector wasn't using the typical Grove pinout. Luckily, I came here to check the sensor types before plugging anything in. I was able to rearrange the pins inside the connector on one side, so that the colors match and one can plug the other end into a standard Grove I2C port. I've marked the connector, so that hopefully I'll remember that it's no longer a straight cable.

BG451141513 08/12/2021
I am very happy with this so far. It works well with my ESP32S (ESP-WROOM-32) using I2C. My only complaint is the color of the wires. The SCL connection is on the white wire, the GND connection is on the yellow wire, the SDA connection is on the red wire, and the VDD connection is on the black wire. I really wish the ground was black and the VDD was red. So far I have tried the SparkFun library for the AHT20 and the Seeed Studio driver for the BMP280. Each of those libraries are easy to use, and their only dependencies are the standard Arduino libraries. The sensors are two discrete devices on this chip, using addresses 0x38 and 0x77. I have not verified which sensor is at which address because the libraries I am using do not require me to set the address. The BMP280 reads about 1.6°C higher than the AHT20 reads. I have not calibrated these against any other sensors.
Módulo de Sensor de Temperatura e Umidade de Pressão Atmosférica AHT20+BMP280 de Alta Precisão com Cabo de Conexão para Arduino.
US$3.99 US$9.99
2
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fuiru 25/04/2019
I'm very impressed with this microscope. I'm using it for SMD soldering. The stand is solidly built and unlike the cheaper microscopes of that design, the optics are designed so that there is ample workign space under the lens, which is particularly important for soldering. Picture quality is superb and thanks to the two independently adjustable LED arms, one can get plenty of contrast even in tricky situations, such as for reading an etched part number on a small chip. There are some very minor drawbacks. Although the device is USB powered (very good), it comes with a special cable with an inline splitter that feeds and controls the LEDs as well as the micro-USB power supply to the actual scope on the screen. A standard cable would have been nice. Adjusting the screen makes an ugly clicking sound that doesn't bode well for durability, but fortunately, I don't need to adjust the screen often.
Andonstar ADSM302 Microscópio USB Digital Longa Distância do Objeto para Ferramenta de Solda e Reparo de Celular
US$259.59 US$283.99
2
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fuiru 24/05/2021
This is my first singing bowl and I have no prior experience playing one. It took only a few seconds of gently running the wooden mallet around the rim for the bowl to start singing softly, then getting progressively louder. It's much easier to play than I expected. I bought size 12 and the base tone is approximately a C#5.
Tigela Tibetana de Tamanho Múltiplo para Canto Tigela para Meditação e Som para Meditação Yoga
US$15.89 US$19.07
0
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fuiru 06/08/2020
Finally arrived 5 months after the order. I'm not sure if it has been sitting in a very hot warehouse. All the plastic sleeve pages are stuck together. Labels had been applied to every sleeve with the resistor size, value and tolerance, but the glue on the back of the label no longer sticks. Instead, the front side of the labels sticks to the page before it. Even when carefully separating the pages the writing on the label comes off. Will have to clean everything and relabel, which is tedious.
Aemedy® 8500Pcs 0805 1% SMD SMT Chip Resistor Assortment Kit 170 Values Sample Book
US$25.99 US$39.99
1
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fuiru 24/09/2020
Shipped very quickly. Even comes with a case. I'm really impressed that this can be made for such a low price. This is a really decent phone. Bought as a backup phone, but it can easily compete with my primary phone (Pixel 3).
Xiaomi Redmi 9 Versão Global NFC 6,53 polegadas Quad Câmera traseira 4GB 64GB 5020mAh Helio G80 Octa core 4G Smartphone
US$149.99 US$229.99
0
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fuiru 02/08/2020
Works well with the Google Pixel 3. This charging stand is extremely light and will fall over easily. All edges and corners are sharp, except for the corners that were banged up during shipping. Even when no phone is on the charger, it makes a very soft beeping noise about twice a second, but this is only audible in a quiet room, or when your head is close to the charger. Classic case of You get what you pay for.
Bakeey 20W Double Coil Fast Qi Wireless Charger Dock Stand para Samsung Huawei
US$20.99 US$25.99
0
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fuiru 19/02/2020
Since this was a mystery box, I didn't expect much from the flashlight, but was very positively surprised. The light I received is well made, has numerous intensity and flashing modes and came with a removable Li-Ion battery that can also be charged with the included USB micro cable in the flashlight itself. High intensity is very bright and the lower modes help conserve batteries and retinae.
Lanterna de caixa de ano novo
US$9.99 US$19.17
0
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Machifit 3-5V 2 Phase 4 Wire Stepper Motor 8mm Micro Stepping Motor
US$7.99 US$9.99

Q: How many steps per revolution?

perguntado por fuiru sobre 2019-12-26 10:14:04

Anorchous 18 degree

2019-12-27 12:49:33 Útil (1)
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respostas (1)
CJMCU FT2232D R Geração 3 FTDI USB para UART / FIFO JTAG Programmer Módulo Serial
US$15.99 US$19.99

Q: What is the JTAG Connector Pitch? (2mm, 2.54mm or less?)

perguntado por dimikan sobre 2019-03-07 03:45:59

fuiru The pitch is 1.27mm

2019-07-30 02:52:10 Útil (0)
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respostas (2)
fuiru 09/07/2019
Works well for testing the DIY Geiger counter kit.
Ion Chamber Alarme de Incêndio de metal Contador Geiger Sensor de Teste de Fumaça Sistema de Segurança
US$3.99 US$4.99
0
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fuiru 05/07/2019
Used on a Raspberry Pi together with a RAK831 Lora Gateway module from Banggood. Works like a charm and is able to acquire its position even indoors.
Módulo de antena Beitian Dual BN-220 GPS GLONASS TTL para drones e aviões RC
US$19.99 US$41.59
0
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fuiru I no longer have the packaging and shipping label. Photos of the product don't help either. I'm just trying to help other customers fix the problem with the HX711 PCB included in this bundle. You can verify if the HX711 board has a problem by using a multimeter to measure the resistance between GND and E-. Those should be connected (see HX711 datasheet). The other board on Banggood (p1039638) is designed well and has this connection.

fuiru 01/08/2018
I was able to get this working very quickly, but the values coming from the HX711, with no load on the bar, kept drifting very significantly. After a long troubleshooting session, I found out that the HX711 print has a major design flaw. They forgot to connect the AGND pin of the HX711 to GND, so it's just floating in the air, explaining the drifting. This can be fixed by soldering a wire between the GND pin on one connector and the E- pin on the other side. I found the exact same board on a different site with a picture of the schematics. This confirms that AGND is not connected to GND. See attached picture. It's also important to note that the print is designed to be supplied with 5V, even though the HX711 is specified to work down to 2.6V. The internal voltage regulator on the HX711 is configured with R12 and R13 to produce 4.2V across the sensor (E+ and E-). Considering the drop across the transistor, the supply voltage needs to be about 4.5V (or up to 5.5V), otherwise the regulator can't do its job. If a 3.3V supply is provided, the resistors can be changed accordingly. If you use it as is on 3.3V, be aware that the built-in regulator will not be able to do its job, so any ripple on the supply voltage will influence the measurement.
Módulo HX711 + Sensor de carga de célula de pesagem em liga de alumínio de 20kg
US$6.99 US$13.99
10
Comentários (3)
fuiru 25/01/2018
I'm very fond of the board's form factor, but there are some quality issues with the particular board I received and some design issues that affect every board. Production issues: * Instead of a green LED to indicate that charging is complete and a red LED to indicate charging, mine came with two green LEDs. * The charging/charge complete LEDs get very hot. This is a production issue, since the current limiting resistor for those LEDs should be 1k according to the TP5410's data sheet. However, mine came with a 81 Ohm resistor. Simple production mistake. Resistor code 810 does NOT mean 810 Ohm, which would be okay, but 81x10^0 = 81 Ohm. Design issues: * The battery voltage gets boosted up to 5V, then reduced back to 3.3V for the CPU. That's good if you need a 5V supply for anything you connect, but keep in mind that roughly 30% of the battery's energy gets wasted in the linear regulator. * For a battery powered product, you will likely want some indicator when it's time to recharge the battery. Even though battery voltage isn't a perfect indicator, at least a voltage divider connected to an ADC input would be nice, as it costs next to nothing. * The USB connector and switch are on opposite sides. When designing an enclosure that gives access to both, this design doesn't allow you to make a wider box. Banggood description: If I read the TP5410 datasheet correctly, the charge current limiter is set to 1A (680 Ohm resistor), not 500mA.
WeMos® WiFi + Bluetooth Bateria ESP32 Ferramenta de Desenvolvimento
US$10.40
14
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Comentários (3)

fuiru I have the same issue. The LED that's attached to the TP5410's pin 2 (the one further away from the USB connector) is the charge LED, which is supposed to be red. However, mine is green. I'll submit a separate review with picture.

pascu 28/08/2017
"indicate LED inside(Green means full& Red means charging)" There is not red led.
WeMos® WiFi + Bluetooth Bateria ESP32 Ferramenta de Desenvolvimento
US$10.40
1
Comentários (2)

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