tscircuit•3w ago

Ray Kholodovsky - "Can I ask parts-engine a que...

"Can I ask parts-engine a question or is it only run automatically during compile?" I'm mentally architecting my modules, starting with a simple one like "Power LED", which I want to use a calculation to set the LED brightness to a particular target based on the provided input voltage, and return an LED and a resistor of appropriate value. We discussed all this here before: https://github.com/orgs/tscircuit/discussions/763 The question now, is when my calculator returns an exact value of 6250 ohms, can I ask parts-engine to find the nearest size that is under the basic list? Or do I have to bring in that list myself and handle all of that selection logic myself in my userland module?

GitHub

Math! Equations! Calculators! · tscircuit · Discussion #763

As we discussed here, we can do expressions and basic math right in TSX, cool! https://discord.com/channels/1233487248129921135/1353415621995397172/1413333949417259098 However, I think it might be ...

10 Replies

Ray KholodovskyOP•3w ago

For example, in my led calc, I can see that 6.2k ohm is the closest match if I'm using 0603 components but not 0402; if 0402 I can bounce over to 5.6k which is the next closest match.
My system lets me do all this, the question is whether I can use any parts of tsci to do this for me, or if I have to bring over all this logic including the list of JLC basic resistors hardcoded into my userland code.

Ray KholodovskyOP•3w ago

Or perhaps what I am asking is more akin to making an API call to https://jlcsearch.tscircuit.com/resistors/list?package=0402&is_basic=true&resistance= ?

Seve•3w ago

there are a couple ways this can get done depending on your preference - Enough specifications supplied + supported for the <led /> component, in this case the parts engine will handle it. IIUC you have an RTarget that you want, so we would need to add that as a property/filter. We would also add a tolerance - Supply a manufacturer part number directly and use your own script (or provide your own platformConfig.partsEngine that extends the existing parts engine) - Allow a coding agent like Claude to use tsci search and evaluate options, then place a mpn on the <led /> for you I think we should have a doc page for this, CC @Rishabh

Ray KholodovskyOP•3w ago

Enough specifications supplied

For the LED this will be completely constrained by us, my input parameters might be "led 0402 red" and that would select from our preferred list à la here, which would contain 5-10 items total. For the resistor, I want to only constrain it enough by saying "res 0402 from jlc basic or preferred, find the closest match to 6250 ohms" and this is the root of the question I am asking - there's no MPN that I care about to speak of, just find the closest match from the list, like the list I used here: https://github.com/CDFER/jlcpcb-parts-database?tab=readme-ov-file

GitHub

GitHub - CDFER/jlcpcb-parts-database: Automatically updated sqlite ...

Automatically updated sqlite database of JLCPCB parts, filtered to only include components in stock. Includes a CSV file of basic and preferred parts. - CDFER/jlcpcb-parts-database