4 ms·
Was the decision to use pin headers instead of SMD components a conscious choice? For the particulate sensors it's unavoidable but you can use Sensirion's SCD4
by Youden 4y ago
Was the decision to use pin headers instead of SMD components a conscious choice?
For the particulate sensors it's unavoidable but you can use Sensirion's SCD4X series for CO2, just about any VOC chip you want, and an ESP32 module instead of dev board.
It should be substantially cheaper overall since the components can be ordered in bulk and the only assembly needed would be the particulate sensor.
I've been meaning to get around to it myself but I still haven't settled on how to power it. I'm really tempted to try stuffing it full of giant batteries so that it can run for at least around a year without a cable.
- ahaucnx 4y agoMost people find it easier to solder through holes than SMD. We use SMD in our commercial product. We are testing the SCD4x and like it so far. It might be a future option.
- Youden 4y agoI guess what I'm asking is does it need to be hand-solderable? With places like JLCPCB offering cheap SMD assembly, SMD boards are still accessible to hobbyists.
- mardifoufs 4y agoI though JLPCB only assembled components that are available in their catalogue. If they don't have the part you need, you'll have to hand assemble it. These are pretty niche components, with odd footprints and size so I'd be surprised if assembly was available.
- Youden 4y agoYou can have them order parts that are available at Mouser, Digikey and the other parts vendors. They have the SCD41 [0], SGP41 [1] and a variety of ESP32 modules (e.g. [2]) in their catalogue. The preorder prices can be a bit out of whack but they'll correct them when they actually buy the part. [0]: https://jlcpcb.com/partdetail/Sensirion-SCD41_DR2/C3659294 https://jlcpcb.com/partdetail/Sensirion-SCD41_DR2/C3659294 [1]: https://jlcpcb.com/partdetail/Sensirion-SGP41_DR4/C3659325 https://jlcpcb.com/partdetail/Sensirion-SGP41_DR4/C3659325 [2]: https://jlcpcb.com/partdetail/EspressifSystems-ESP32_S2_MINI_1N4/C2847294 https://jlcpcb.com/partdetail/EspressifSystems-ESP32_S2_MINI...
- comboy 4y agoIf you want continuous measurement, battery is pretty much not an option, PM2.5 will use a small fan, so even at 30mA it's 30 * 24 * 365 so for a year you need 262,800mAh battery, it's a different voltage but to put it in context your laptop is likely under 10,000mAh. If you only need to take measurements say every 30mins then sure, but then either you worry about sending it somewhere and receiving it or you need to use additional battery power for displaying it.