An open source frequency meter and clock generator


Boris Landoni writes about an open source project frequency meter and clock generator:

On the hardware of the controller board LED Matrix, by taking advantage of the reconfigurability of the onboard FPGA, we can build a bivalent tool that is extremely useful to have on our work bench.

Via Open Electronics.

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  1. While I understand this is more educational than practical in nature, I prefer my edutainment a lot more firmly grounded in economic reality. Sure, you could use an FPGA to painstakingly try identifying and counting edges, a task that a humble chain of counters would do natively better and far, far cheaper; much the same way you could build a roomba to cleanup the mess caused by ashtray you just inadvertently flipped onto the floor. Then again, most people would just reach for a broom…

  2. Ah, the site sells boards, that’s the reason. At least it’s a XC6SL9 board that does not cost an arm and a leg, though it does not have SDRAM if you want to work on projects needing lots of memory in the future. Still, it looks like a nice FPGA board.

    One problem: “terminals of a quartz of a PC motherboard”. More likely a mobo has a 4-pin oscillator. An actual quartz oscillator circuit (that is, the usual OSC1/OSC2 lines going into say, an MCU and can be probed) will not be able to drive what he needs as input to his meter. So what he really means is the output line of the 4-pin oscillator.

  3. There should be a warning that the link goes to a site with a big pop-up that blocks the article text.

    1. I think you will find that it’s quite common among sites that want your eyeballs, particularly news sites. They really, realy want repeat eyeballs. It will get worse. If they are nice they will only ask once, but if you scrub your browser data regularly, you will see it many times.

      I read a science news summary thing regularly and links go to many newspaper sites. Many do have popups that entice you to be a repeat visitor by registration or something. Of course, UK sites always have that “agree to our cookie policy thing” as well. Then there’s that notification thing. Then there’s that location thing.

      There are worse things — e.g. sites designed for mobile phones. Your right click no longer works, or works like left clicks. Options panels that presumably work on phones, but just gets in the way on desktop screens or do not work right. Terrible, terrible monstrosities.

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