esp32
| Model | Core | Co-Proc | Ram | Wifi | Bluetooth | Peripherals |
| ESP32 | Extensa 32bit LX6 240MHz (2) | FSM | 520k | wifi4 | bt4.2 | |
| ESP32-S2 | Extensa 32bit LX7 240MHz (1) | FSM & RISC-V | 320k | wifi4 | x | USB Serial, 8-bit DAC(2) |
| ESP32-S3 | Extensa 32bit LX7 240MHz (2) | FSM & RISC-V | 512k | wifi4 | ble5 | USB Serial |
| ESP32-C2 | RISC-V 32bit 120MHz (1) | 272k | wifi4 | ble5 | ||
| ESP32-C3 | RISC-V 32bit 160MHz (1) | 384k | wifi4 | ble5 | ||
| ESP32-C6 | RISC-V 32bit 160MHz (1) | 384k | wifi6(2.4ghz) | ble5 + zigbee | ||
| ESP32-H2 | RISC-V 32bit 96MHz (1) | 256k | x | ble5 + zigbee |
### Blinky (ESP32-S module; ESP32 + 4m flash)
- ESP-Strapping
- GPIO
- GPIO12 float low - low 3.3v, high 1.8v (VDD_SDIO)
- GPIO15 float high U0TXD - high logging, low silent
- GPIO 0 float high, GPIO 2 float low - Flash boot
- GPIO 0 gnd low, GPIO 2 float low - Serial boot
- ESP32-S pins
- pin25 - programming
- 1,38,15 - GNDs
- 2 - pwr, 3 - enable
- ADC1 (ADC2 unavailable w/ wifi)
- Sep 2019
- Oct 2019
- Move ADC port to an ADC1 Pin pin4-9
- Another ADC Pin to 3.3v input?
- Another ADC Pin to vdivider + 15v input
- Add 3.3v to top of ADC
- drop 3.3io and 3.3 power ports
- add oled/serial port at edge
- short rx/tx lines pin34&pin35
- Nov-B 2019 (send to pcbs.io)
- LMS8117AMP-3.3/NOPB
- LCD pin23 DO, pin16 CLK. (any GPIO)
- POWER idle 115mA with esphome
- POWER 16 neopix 17ma(low) 177ma (full red or green or blue) 305ma full white
- POWER neopix 20ma per color per led
- Nov-C 2019
- Reset line (no room)
- connected 3v bus
- vreg cap
- volt Divider ADC (no room)
- add pullup resistor to one port (for i2c temp sensor)
- U0 TX 500ohm R close to esp32 (reflections)
- Dec-D 2019
- move pin20 (SD1 CLK) to 12 G27 DONE
- add 4-pin switch port (switch+status led)
- LVDS connector
- GPIO12 1.8 vs 3.3v pin14
- flip micro USB DONE
## wall switch
- switch
- switch backlight
- photosensor
- distance sensor
- status led
- lcd display
## photoresistor
- super-bright (from cell phone) 300KOhm
- super-dark (fabric lightly covered) 10MOhm
## signal harmonics https://electronics.stackexchange.com/questions/33372/spi-bus-termination-considerations
esp32.txt · Last modified: 2023/05/31 02:07 by donpdonp