More China

Well, not much. Only a batch of 20x 1 Ohm, 3W resistors. Need them for my current control circuit. 30 days delivery time… woohooo…


China complementary order

Ordered a few more things;

  • 10x 74LS08 (Quad AND-gate)
  • 50x BC547 (common NPN-transistor)
  • 10x BD243C (heavy duty NPN-transistor)
  • Ceramic capacitor set (300 pcs)
  • 100x 3mm LED set (white, yellow, red, green and blue)

Ordering this from China was cheaper than ordering a single 74LS08 from an electronics supplier in Sweden. Sweden delivery would have taken only 1-2 days though. Chinese delivery even with a bit of upgrade in shipping is still going to take 20-30 days.

Current limiter circuit

Got it working in Multisim, an electronic circuit simulator.

Why am I working on a current limiter circuit? Well, because I quickly flubbed and burnt one of my Arduino Nanos by way of short circuit and in the future Id like to avoid losses because ordering new stuff from China is a painfully slow process.

China order

Ordered a bunch more toys from China, including;

  • Two 5V 5F supercaps
  • Two ESP-12F (ESP8266 WiFi module)
  • One 4-channel 16-bit ADC I2C breakout board
  • One GPS module
  • Five more 32×8 LED matrix modules (to add to the one I have)
  • Two 5V DC power regulators
  • Three 8-bit logic level converters breakout boards
  • One USB V/A/W meter
  • Two mini DC regulators
  • Two HB100 microwave doppler radars (motion sensors)
  • One small servo motor
  • One USB-to-serial adapter
  • Two realtime clock breakout boards
  • One electrolytic capacitor set (120 pcs)
  • One resistor set (600 pcs)
  • One 125kHz RFID reader module
  • Ten 125kHz RFID keyfobs
  • One temperature sensor
  • One OV7670 camera module
  • Two (more) Arduino Nano v3
  • One Arduino Pro Mini (why not, cheap, and I should try all the Arduinos some day)
  • One Arduino Mega

Delivery: Before 2018? Aliexpress is cheap but retardedly slow delivery.

Happy new LED matrix

Received package from China yesterday. Went through all the goodies quickly and my attention stopped at the 32×8 LED matrix. Worked on it the rest of the evening, got it powered up and figured out how to light individual LEDs just before it was bedtime.

This morning I continued with the Arduino programming and by noon I had the result I was aiming for, for now.

“Happy new year 2017!!!”