Tag: LED

Voltlog #133 – Good Deal On Electronics

Just a short update to let you know there will be some price cuts on the usual suppliers from China on the 11th. It’s a good chance to get stuff at discounted prices.

Voltlog #132 – 4 Digit LED Panel Meter Review

Do I recommend getting this module? Yes, the accuracy is good, the resolution is nice 10mV 1mA and you also have the option for adjusting it manually for both voltage and current.

The design is pretty simple, I believe the microcontroller is an STM8S so hacking it and rewriting the firmware should be pretty easy but it already does what it’s supposed to do so I don’t see a point to hacking this module. I think you would be better off designing a panel meter from scratch.

Buy this panel meter from here.

Someone asked on youtube how should a panel like this be wired up, so here is a wiring diagram that you can use. In this wiring diagram our goal is to monitor the voltage and current for charging a battery.

Example 1 shows the panel meter connected before the battery charging module, which means it will measure everything, even the power losses in the battery charging module.

Example 2 shows the panel meter connected after the battery charging module, which means it will only measure current flowing into the battery or whatever load you have on the output.

In both cases voltage sensing is done right at the output but that wire can be moved according to your needs. Also in both cases the panel meter gets power directly from the power supply because at that point the voltage is constant.

The main thing to remember here is that these panel meters are designed for low side current sensing, that means the ground of the logic board of the meter is connected with the input of the shunt resistor.

Voltlog #122 – C5W LED vs Incandescent Bulb Temperature

Welcome to a new voltlog, in a previous video I showed these C5W LED bulbs that I got from ebay they were very cheap so I put them to a test and discovered they reached very high temperature in just 15 mins of running in free air which got me concerned, the fixture of this bulb could melt.

C5W LED Bulb on Ebay 

C5W LED Bulb on Aliexpress 

C5W LED Bulb on Banggood 

Thermometer used in this video

Voltlog #83 – InTheMail

Hello, and welcome to a new InTheMail. It’s been awhile since we’ve had one but don’t worry small packages from China continued to arrive, even through the holiday season and as a result I have plenty of new stuff to show on video.

Voltlog #77 – InTheMail

Here is a list with the items shown in this video:

  • USB Drive Spy Camera
  • 35W Radar Motion Sensor Switch
  • 4 Channel Wireless Remote Control Switch
  • 64 LED 20W 2835 Horizontal Led Light
  • 64 LED 60W E27 5730 Light Bulb
  • 21 LED 15W E27 Globe Light Bulb
  • 21 LED 15W E27 Energy Saving Light Bulb

Links for all of these will be in the video description on youtube.

Voltlog #73 – InTheMail

Welcome to a new InTheMail, the series that everybody seems to like, seriously I’m thinking this is starting to look like some group meeting where we all have the addiction to keep purchasing cheap electronic stuff from China.

Here is a list with the items shown in this video:

  • SG3525A PWM generator module
  • Photocell Automatic On/Off Light Switch Relay
  • B0505S-1W Isolated 5V DC-DC Converter
  • 5V 2A DC-DC Converter USB Charger With Voltmeter Module
  • 5V 3A DC-DC Converter USB Charger Module
  • 12V 0.5A AC-DC Switching Power Supply Module
  • LCD1602 I2C Serial Interface Adapter Module
  • WS2812 RGB LED Controller
  • WS2812 RGB LED Strip PCB Module

You can find links to all of these items in the video description visible on youtube.

Voltlog #51- InTheMail

Here is a list of the items shown in this video:

  • Led 1w amber
  • 3W cool/warm white LED
  • 6W COB LED
  • 16×2 LCD HD44780
  • CREE XPE-R3 LED Mini Penlight Flashlight AAA
  • Green High Power Burning Laser Pointer
  • Green Laser 473nm Protection Glasses
  • HT7333 LDO Regulator
  • 2xAAA Battery holder
  • AAA 1.2V NiMH Rechargeable Battery
  • Terminal Block Connectors
  • 20 Pcs Gold Plated 4mm Banana Plug
  • Silicone Rubber Fan Mounts
  • 16mm Rotary Knobs
  • Neodymium Countersunk Hole Magnets
  • Dental Mirror
  • New T-Handle Tap Wrench Capacity M3-M6

You can find links to all these products in the video description.

Voltlog #40 – InTheMail

Once again too many mail items to fit into a single video, so we have a two parts upload. In the first video I only had time to show two items the SONOFF from ITead and the SP mini from Broadlink but that is including teardowns and discussions on the internals.  Surprisingly the SP mini doesn’t use the ESP8266 as expected but instead it uses the MT7681 from MediaTek.