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  • Streaming radio receivers with the Raspberry Pi

    Posted on January 29, 2014 11:12 pm by Johan

    rpi_audio_stream

    The Raspberry Pi is a small computer that has become very popular. Lots of applications and hardware hacks have been made for it. You can run various software like web/file/printservers, read out sensors, the possibilities are endless.

    I own multiple Raspberry Pi’s, one is a test platform for sensors, and a new one pictured above will be dedicated to audio streaming. I use the software packages darkice and icecast2 to capture the audio from an USB audio card and make it available on the internet.

    To stream audio with the RPi you’ll need the following hardware and software: Continue reading → Post ID 1326


    📂This entry was posted in Electronica english wetenschap/science zendamateur/ham radio 📎and tagged darkice english ham radio raspberry pi raspbian receiver scanner

  • Raspberry Pi remote sensors

    Posted on May 1, 2013 3:09 pm by Johan

    I recently bought a Raspberry Pi to experiment with. The first things I did with it was connecting and reading out Maxim Integrated DS1820 one wire temperature sensor and the cheap Chinese DHT11 temperature / relative humidity sensor.

    To connect the sensors, I soldered some female pin headers to a piece of PCB. For the one wire network I soldered a 4.7K resistor between Vcc on pin1 (3.3V) and GPIO4 on pin 7. GPIO4 is the data pin for one wire, I used GPIO2 as the data pin for the DHT11.  DHT11 “modules” with a PCB and three pins have their own pull up resistor, the separate 4 pin sensors don’t. Shown below is the quick setup, I soldered the DS1820 directly to the PCB, and connected the DHT11 with some wires for 3.3V, data and ground.

    rasp_gpio_ds1820_dht11

     

    GPIO pinouts differ between the Raspberry Pi versions, I found the following pinout to be correct for my Raspberry Pi, a model A version 2.

    Reading out the sensors is easy. For the DS1820, load the required kernel modules which are included in the Raspbian Linux distribution: Continue reading → Post ID 1326


    📂This entry was posted in computers-networking Electronica english wetenschap/science 📎and tagged cacti dht11 ds1820 Electronica linux raspberry pi raspbian sensors snmp

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