Electronics > Projects, Designs, and Technical Stuff
Bed of nail programmer - resources?
jnz:
I'm not sure, but I think there should be pogo pins that I can place into a 3D printed bed with some accuracy. Ideally I'd be able to find some pins that press in and I can run wires to, but I'm thinking it's more likely I'll have to roll a custom circuit board to hold pins and a 3D printed or machined fixture to then hold the board in the right place.
Has anyone made fairly inexpensive bed of nails programming fixtures and liked some parts or ideas over others?
KL27x:
Are you probing random test points splayed out over distance to verify the board/circuit or are you just probing an ICSP/JTAG header?
langwadt:
--- Quote from: jnz on January 12, 2019, 12:35:15 am ---I'm not sure, but I think there should be pogo pins that I can place into a 3D printed bed with some accuracy. Ideally I'd be able to find some pins that press in and I can run wires to, but I'm thinking it's more likely I'll have to roll a custom circuit board to hold pins and a 3D printed or machined fixture to then hold the board in the right place.
Has anyone made fairly inexpensive bed of nails programming fixtures and liked some parts or ideas over others?
--- End quote ---
pcbs are so cheap it'll be hard to find something cheaper
sleemanj:
I recently (well, 6 months ago) made a pogo test jig, home etched and 3d printed.
Don't underestimate the force required to press them down if you have a number of them, my jig has 30 pins, 15 a side it takes considerable force. A toggle clamp ended up being the simplest way, I tried a number of different designs for a 3d-printed hold down method and couldn't get anything that was very reliable.
Even though the point of a pogo is that they can take up small variances, getting them aligned to the same height is still pretty important in my experience, they can be really finicky.
3d printing jigs - you'll probably go through a few designs, one problem I had is the very slight tolerance differences in my (admittedly old crusty and low quality) 3d printer meant that, for a 30 pin jig after tuning in in the hole diameter so it fit the pins snugly, some holes were too large and some were too small, so then you have to drill, which and getting the drill straight means a press really, and drilling PLA isn't great...
In all, next time I make a similar jig I would have perhaps been better to have printed a pattern on paper, glued it to wood and drilled that as the pin-aligning part of my jig underneath the PCB (or, indeed, attached the etched PCB to the block of wood and drilled both in a press at the same time).
cdev:
--- Quote from: jnz on January 12, 2019, 12:35:15 am ---I'm not sure, but I think there should be pogo pins that I can place into a 3D printed bed with some accuracy. Ideally I'd be able to find some pins that press in and I can run wires to, but I'm thinking it's more likely I'll have to roll a custom circuit board to hold pins and a 3D printed or machined fixture to then hold the board in the right place.
Has anyone made fairly inexpensive bed of nails programming fixtures and liked some parts or ideas over others?
--- End quote ---
The ones I've seen have used big thick pieces of acrylic plastic to hold the pogo pins, not 3D printed holders.
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