jayelen
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jayelen 07/07/2020
A very good general purpose GPS module, widely compatible with the NEO-M8N by U-blox. I tested it with the u-center software on PC (by means of a UART-USB adapter), it catches GPS satellites (USA) as well as GLONASS satellites (Russia), and emits the same default set of NMEA messages as the NEO-M8N (see first picture). It accepts UBX configuration messages, and reports the same software and hardware version as the NEO-M8N (see second picture, BN-220T is on the right side). I compared the 3D fix accuracy, it seems is as good as the genuine u-blox module, which is much more expensive.
Beitian BN-220T GPS GLONASS Module For APM Pixhawk CC3D Naze32 F3 F4 Flight Controller RC Drone Airplane
US$15.00 US$30.39
12
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jayelen 05/01/2020
Panel Voltmeter-Ammeter Accuracy checks : see attached pictures : Voltage accuracy : Excellent Current accuracy : Good Measured transformer ratio : 1:1000 Measured secondary load resistor : 10 Ohm
Geekcreit® AC 60-500V 0-100A D18 Square LED Digital Dual Display Voltmeter Ammeter Voltage Gauge Current Meter
US$6.99 US$8.99
2
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jayelen 12/03/2021
All preliminary tests successful. I installed the built environment on a Windows 10 PC, then compiled and loaded the program LVGL/lvgl_button as suggested by the paper manual. This programs displays 2 touch buttons and reports the events to the serial console via USB. Note : This is a T-Watch 2020 V1, you have to update this info in config.h for every example program. Note : This program tests only one function, it does not enable the power management so you cannot switch the watch off. In order to regain control over the battery, I compiled and loaded a more complete demo LVGL/SimpleWatch. This one enables the power button and the battery status widget. It also allows to test the WiFi connection and the NTP sync (network time) over WiFi. Then the watch displays time accurately, but in the China timezone (see picture)! This is hardcoded, but easy to change (#define RTC_TIME_ZONE in gui.cpp). The next step is to get rid of the Arduino IDE, which is not efficient to manage large software projects like this one. But I recognize that the Arduino kit is very comfortable for a quick easy start.
LILYGO® TTGO T-Watch-2020 ESP32 Main Chip 1.54 Inch Touch Display Programmable Wearable Environmental Interaction Watch
US$59.99 US$75.99
1
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jayelen@RefrigeratorDan Thanks !

jayelen 18/10/2018
good deal for those who are interested in discovering how those USB power banks are made. For people interested in technical details, this case is based on a HT4928S chip made by HOTCHIP, which works as charger and DC-DC converter. Datasheet available only in chinese, but schematic easy to understand.
DIY 18650 Battery Charger Case Box USB Power Bank Box For iPhone Smartphone
US$8.99 US$10.99
1
Comments (2)
Retro Round Frame Metal Anti-blue Radiation Glasses Ultralight Fashion Circle Glasses
US$12.99 US$15.99

Q: son lentes anti luz azul?

Asked by BG374701215 on 2021-03-01 11:44:21

jayelen noson. solo buenas gafas de lectura transparentes

2021-03-25 09:04:05 Helpful (0)
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MJX B2W Bugs 2W Monster Brushless 5G WiFi FPV With 1080P HD Camera GPS RC Quadcopter RTF
US$183.84 US$215.22

Q: можно заказать аккумуляторную батарею вместе с ним?

Asked by pyatkov82 on 2019-03-12 05:45:44

jayelen >

2021-03-25 08:57:48 Helpful (0)
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jayelen 12/03/2021
I received it quicker than expected, that is good. Testing it will require much more time, but I have to fill this review in order to have other reviews published. Previously I was dissapointed to read reviews saying "not tested yet", now I understand how people are tricked into doing this.
HX711 24bit AD Module + 1kg Aluminum Alloy Scale Weighing Sensor Switch Load Cell Kit
US$2.99 US$8.00
0
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jayelen 18/10/2018
good deal for those who are interested in discovering how those USB power banks are made. For people interested in technical details, this case is based on a HT4928S chip made by HOTCHIP, which works as charger and DC-DC converter. Datasheet available only in chinese, but schematic easy to understand.
DIY 18650 Battery Charger Case Box USB Power Bank Box For iPhone Smartphone
US$8.99 US$10.99
1
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Comments (2)
Beitian BN-220T GPS GLONASS Module For APM Pixhawk CC3D Naze32 F3 F4 Flight Controller RC Drone Airplane
US$15.00 US$30.39

Q: What are the differences between bn-220 and bn-220t?

Asked by ammore on 2020-05-16 08:33:56

jayelen The ceramic antenna is different : BN-220T has a 2mm thicker antenna ('T' is for 'Thick'). As a consequence it is a little heavier. The benefit may be a more efficient antenna, but this is difficult to prove.

2020-07-07 04:58:43 Helpful (6)
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jayelen 05/01/2020
Grip strength is not as good as similar products, but it is still worth the price
10m Nylon Cable Ties Wrap Ties Fastening Cables Wire Cable Line Holder Winder Clip
US$4.00 US$9.99
0
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jayelen I fully agree, thank you for confirming my observations. You not only increase the efficiency, but also the LED lifetime

abelgon 27/12/2018
This LED plate is much more efficient if the current indicated by the manufacturer is significantly reduced. It is much more efficient if the current is reduced four times. better is to increase the number of LED plates and decrease the current to each one, heat less, consume less energy and increase the intensity of the light emitted. In this order I bought three of white light and one of white warm light.
LUSTREON High Power 50W 100W 150W LED COB Chip DC32-34V DIY for Flood Light Spotlight
US$8.99 US$10.99
6
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jayelen 23/02/2019
I ordered this lamp because it accepts a wide range of supply voltage. After testing, I confirm that it works from 12V to 35V, with a constant light power. So it is suitable for trucks and boats that have 24V batteries. I will order several ones to install on a boat. Note that as delivered it is not waterproof, but with the addition of some sealant you can make it waterproof.
Universal Motorcycle Motorbike 4 LED Front Headlights Driving Fog Spot Lights
US$6.82 US$7.24
0
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jayelen 18/10/2018
Thank Banggood you for sending me this as a gift. The intention is good, but the product itself is ugly !
1pc Jokes Fly Funny Toys Gags Practical Plastic Bugs Fool Party Props Flying Decoration Toys
US$5.93 US$7.99
0
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jayelen 18/10/2018
The graphite square flies at about 0.3 mm above the magnets and is perfectly stable. 18 magnets are provided, which lets you experiment various combinations. The combination which is presented in the wood box allows 4 stable position of the graphite square.
Pyrolytic Graphite Magnetic Levitation WoodBox Set Diamagnetic Science For Kids Educational Toys
US$21.03 US$25.69
0
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jayelen 18/10/2018
Very useful product - produit très utile
Suleve™ ZT06 100pcs Releasable Nylon Cable Core Wire Zip Ties Strap Strips 150/200/300mm Length
US$12.59 US$22.65
0
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jayelen 24/07/2018
I did already 4 successful flights. B2C is very easy to use, has a very good stability.
MJX B2C Bugs 2C Brushless With 1080P HD Camera GPS Altitude Hold RC Drone Quadcopter RTF
US$149.99 US$179.99
0
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jayelen 10/06/2018
Excellent optical quality for the price. These glasses are suitable for hyperopia correction, not only for reading. I use them for driving, this is the reason why I chose a model with a wide field of vision.
Retro Round Frame Metal Anti-blue Radiation Glasses Ultralight Fashion Circle Glasses
US$12.99 US$15.99
0
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