Products > Test Equipment
NEW Fluke 87-VI Multimeter
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Everett_Tom:

--- Quote from: linux-works on September 22, 2024, 04:00:09 pm ---any mechanical designers out there want to help?

I have a diy POC working with an esp-01 chip and a coin cell battery.

the next step is to make some small enclosure that fits around a DMM test probe (or maybe replaces it?) and has this button circuit.

if anyone wants to help, we can get this moving along.  the hardware and firmware is not hard; the hard part is making something you'd WANT to hold and be slim enough or hand-friendly enough so that its useful in real life.

I think we can do better than that photo mock-up from Fluke.

--- End quote ---

Have you considered just purchasing an off-the-shelf BLE button? I know I've seen some small ones used for accessories for Selfie-sticks that just act like a BLE keyboard. Alternatively, I think the Fluke 1587 has test leads with a nice build in button that you may be able to use (The Fluke TP-165x is super expensive https://www.fluke.com/en-us/product/accessories/probes/fluke-tp165x, but a knockoff one is like $20 https://www.amazon.com/ZIBOO-Megohmmeter-Insulation-Resistance-Multimeter/dp/B08DCLPDP9 )
Fungus:

--- Quote from: linux-works on September 22, 2024, 04:00:09 pm ---I have a diy POC working with an esp-01 chip and a coin cell battery.

I think we can do better than that photo mock-up from fluke.

--- End quote ---

That's the easy part.

How does it make things happen inside the multimeter?
linux-works:
for my setup, the way I touch the DMM is via its digital interface and I'm limited to it being a one-way push.  for many, its two-way but you dont really need that.  nice to have, but not 100% needed for most tasks.

I'm polling the dmm and getting its value over optical.  my esp chip in that opto poller 'head unit' (literally sits on the dmm's head) will listen for espnow pings from the button and it will mark the current (last) value along with an ntp timestamp of the value.  log to nvram if you want or echo thru websockets to some remote target, etc.

but that's the overview.  a bit of hw that reads a meter and will mark the sample with time when it gets some remote indication.

I've been thinking more about this.  do I really want to make a nice probe awkward to hold?  I'm struggling to think of some 'clamp on' that wont make the probing annoying to use.  also, if you are in a tight area with your probe needle, pressing a button on the probe could very well cause it to slip and short where its not wanted.  what I'm now thinking is the better method is a wireless footswitch.  it accomplishes exactly the same thing, although less sexy.  but way more practical.  no probe movement, you use ANY probe you want (I like my probemasters) and the foot switch is 100% wireless so you locate it where you want.  comments about that approach?  would you use it, if you had some need for this?

the link on amazon on the special button probe is interesting.  I might buy one to just see if its usable.  I can intercept that button and the hardwork (plastic design) is already done.
linux-works:
in terms of BLE, how quick can a pulse be sent across?  I dont normally think of ble as fast for latency. 

I avoided involving any AP and dhcp and went with espnow since its just 'throw wifi frame and exit', so its as fast as you can get.  I might add serial number to each button press so you can detect bounces or drops.
tooki:

--- Quote from: linux-works on September 22, 2024, 10:25:22 pm ---in terms of BLE, how quick can a pulse be sent across?  I dont normally think of ble as fast for latency. 

--- End quote ---
It’s fast enough that, other than for demanding gaming, the latency of keyboards and mice is not noticeable, whether on traditional Bluetooth or BLE.

In other words, it’s plenty fast for normal human interaction.
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