Posts Tagged ‘led’

LED Emergency Lamp

June 16th, 2013 No comments

Here is the LED emergency lamp that’s being sold for few hundreds in the market.  See below for the pictures.  This lamp comes with 60+ LED lamps adding upto a power of ~4.5W.

I have attempted to reverse engineer the circuitry and drawn the circuit using ExpressSCH tool. Click on the image to see the full sized circuit.

All the components listed in the circuit are available in common electronics spares shops. 

Sony UWA-BR100

October 27th, 2012 2 comments
    Today, I purchased the WiFi adapter for Sony 32EX650 LED TV, which is exclusively built for the Sony HD LED TV with USB connectivity.  When I tried plugging that in my Windows 7 x64 PC, the device was not recognized as there was no Windows driver, but the device showed up as CEWL-1.  While discussing about that with my wife, I had to take the brickbats for wasting the money, while we already have wifi access from the available devices.  Now, I had to prove that my investment is worth, but I have no clue how to. 

    Started my search for unofficial drivers for the device in Linux and Windows, following that gracefully landed at, which said that the device is indeed Atheros chipset based and detectable in Linux as ath9k_htc and moreover they had also provided a free download link for getting the all-windows driver.

    Now, I have installed the windows driver and the wifi device works like a breeze.  I have been testing it against B/G wifi network, so the speed I am seeing is 54Mbps.  I will try this again with A/N/B/G to check whether it goes to higher speeds as claimed in the website.  Interestingly, Windows 8 would support these devices out of the box as per this Sony support page.

Update: I have tested the device against a A/N/B/G router in the 5Ghz spectrum and found that the device is connected at 300Mbps speed 🙂  And, indeed it is using the ath9k_htc driver supplied via compat-wireless package.

Ramanashramam going Green

May 20th, 2011 No comments

Ramanashramam is probably the first bigger house that I know of and that’s open for public going GREEN on electricity usage.  The ashram management has enforced usage of LED fixtures as a replacement for incandescent bulbs and CFLs.  They have meticulously changed the focus lamps, 4″ tubes, roof lamps, flood lights, etc to power LED based fixtures despite their initial costs.  A most welcomed gesture to save the planet!

My First Autobot

January 24th, 2011 No comments

Use Cases

  1. Find power source, remember the location map to optimize search of power sources. (eating). Witricity to be attempted.
  2. Find the sound direction and go to the source of the sound (watching TV, music, etc)
  3. Find light sources and move to that direction (vigilance)
  4. If it is dark everywhere, go to lower power mode (sleep)
  5. Avoid obstacles (walking)
  6. Self test for temperature, current flow, battery strength (fitness check)
  7. Report status to humans only while meeting them (consultation)
  8. Know heights and avoid falling of the floor from steps, tables, sofa, bed, etc. (no jumping)

Sensors needed

  1. Direction sensor
  2. Distance sensor
  3. Temperature sensor
  4. PIR sensor
  5. Odometer
  6. Tachometer
  7. Microphone
  8. IR LEDs and IR sensors
  9. Current sensor
  10. Voltmeters
  11. LDR sensor
  12. RFID


  1. ATMega 16/32 on the Autobot side
  2. AMD Phenom II 550BE on the PC side
  3. Communication over 415MHz ASK or Xbee

Fitting LED Strip to Getz Radiator Grill

August 15th, 2010 No comments

White (Blueish) LED strips with 3M water proof stickers are available for 300-350Rs/30cm.  These LED strips are pretty bright when illuminated and draws lesser power when compared to incandescent lamps.

Step 1: Open the Bonnet of the Car

Step 2: Identify the Parking Lamp + Head Lamp Positioning Motor Power Line

Step 3: Remove the Parking Lamp, Lamp Positioning Motor Power Connector

Step 4: Remove the Connector Shield to find the Power lines

Step 5: Find and Tap the Parking Lamp Line.

Step 6: Put the connector shield back on the connector
Step 7: Put the connector back on the Lamp assembly
Step 8: Turn on Parking Lamp; Hurray LED Strip is AWESOME.

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