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Description: The SparkFun Metro-Gnome is a basic digital metronome used to keep time during music practice. This is a basic kit that goes together in 15-20 minutes for people learning to solder, and 5-10 minutes for those with a bit of experience.

Kit Includes:

  • 1 x Metro-Gnome PCB
  • 1 x ATmega168
  • 2 x 7-segment red LED
  • 1 x 10uF cap
  • 1 x 0.1uF cap
  • 1 x 10k resistor
  • 1 x 1N4148 diode
  • 1 x Piezo Speaker
  • 1 x mini power switch
  • 2 x push button reset switches
  • 1 x battery holder pack
  • 4 x 1500mAh AA Alkaline Battery


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Customer Comments

  • Why is there no socket for the Atmega328P? couldn’t you damage the ic from soldering?

  • ——————– Tech Support Tips/Troubleshooting/Common Issues ——————–

    To reprogram the Atmega328P on the SparkFun Metro-Gnome, you would need an AVR Programmer to connect. There is no Arduino bootloader on the board so you would need the makefile to compile a .hex file from the code, flash the .hex file, and set the lock bits. This old tutorial might be of some use => [ ].

    Note: The older versions of this kit used the Atmega168. The current builds are using the Atmega328P.

  • Just built this up with my 10-year-old son. First electronics project ever for both of us, unless you count Snap Circuits. Went together in an evening (~90 minutes) including reading some soldering tutorials. He did 80% of the soldering. We had a couple bad bars on one of the displays, but we managed to track them to bad soldering joints on two pins, and fixed them. He’s thrilled! Thanks for a simple, but useful, starter project!

  • My son was using the metronome while playing his guitar and suggested it would be nice to have a flashing LED along with the clicking buzzer. Simple. I soldered an LED between the AN (#3 pin) and GND (#7 pin) holes on the JP-1 connector at the base of the board. Then added a set bit and clear bit instruction for PORTC, bit 2, surrounding the while loop inside the Interrupt Timer 1 routine. Ta da.

  • This was my 3rd or 4th soldering project.
    When together well and it was a great learning tool.
    Here is a video of me putting it together:

  • This was my first foray into soldering and it went incredibly well. Everything was easy to assemble and the metronome worked without any troubleshooting.

  • FYI, Metrognome is a song by the English progressive group, Camel.

  • What’s with the header at the bottom? According to the schematic, it only has “AN” (PORTC2), GND and VCC. What are those? I know that somebody used it for and LED, but was that its intended usage?

  • I just looked @ the schematic, and it looks like only 8 pins(PD0 thru PD7) are used to control two 7-segs… Am I reading the schematic wrong?

    • Actually it’s 10 pins, PD0 - PD7 plus PC0 - PC1. Put the bit pattern on PD, then allow current to flow through the 7-seg of choice by outputting a low on PC0-1. Output the pattern on PD and ground one of PC0/1 to light up that 7-seg. If you switch back and forth between the two 7-seg fast enough your eye perceives a continuous pattern displayed on each.

  • I built the digital metronome for my wife who is a pianist. She loves it and uses it all the time. Her old metronome is now a dust collector.

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