Verify & Enhance IoT Cooking Schematics
Budget: £350 – £1,500 GBP
I have three interconnected PCBs for an IoT-enabled cooking system and I need a fresh, expert set of eyes on the schematics before they move to layout and certification. My main objective is to drive up reliability while making sure every track and component choice can sail through both UKCA and CE assessments without last-minute redesigns.
Here is the current state of play:
• Power PCB – handles distribution and uses fully-isolated 12 V AC relays
• Controller PCB – AVR32DD32 MCU with four MAX31865 RTD ADCs and RS-485 bus
• UI PCB – ESP32 (external esp32 approved antenna), RS-485 bus, 5-inch EVE4 touch screen, 4 x multicolour LEDs and audio out
The Power board, the Controller board and the UI board all matter equally to me in terms of long-term robustness. Schematics for the first two are at a point where I can get them to; the third will be ready for your review within a few days.
What I’d like from you
1. Detailed schematic audit highlighting/fixing architectural issues, component stress margins, deratings, safety, EMC susceptibility and reliability traps.
2. Concrete design tweaks or alternative part suggestions that improve MTBF without driving BOM costs significantly.
3. A brief compliance checklist mapped to the relevant clauses of the UKCA and CE directives that apply to low-voltage and radio-enabled products.
Acceptance criteria
• Reviews and changes to be carried out on KiCad 9 schematics plus accompanying report.
• Each suggested change justified with reference to reliability data or a specific regulation.
If this sounds like your kind of project, let’s talk timing and any extra documentation you need.
Here is the current state of play:
• Power PCB – handles distribution and uses fully-isolated 12 V AC relays
• Controller PCB – AVR32DD32 MCU with four MAX31865 RTD ADCs and RS-485 bus
• UI PCB – ESP32 (external esp32 approved antenna), RS-485 bus, 5-inch EVE4 touch screen, 4 x multicolour LEDs and audio out
The Power board, the Controller board and the UI board all matter equally to me in terms of long-term robustness. Schematics for the first two are at a point where I can get them to; the third will be ready for your review within a few days.
What I’d like from you
1. Detailed schematic audit highlighting/fixing architectural issues, component stress margins, deratings, safety, EMC susceptibility and reliability traps.
2. Concrete design tweaks or alternative part suggestions that improve MTBF without driving BOM costs significantly.
3. A brief compliance checklist mapped to the relevant clauses of the UKCA and CE directives that apply to low-voltage and radio-enabled products.
Acceptance criteria
• Reviews and changes to be carried out on KiCad 9 schematics plus accompanying report.
• Each suggested change justified with reference to reliability data or a specific regulation.
If this sounds like your kind of project, let’s talk timing and any extra documentation you need.