esp32 [Don Park]

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)	ble5.2
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
oshpark https://oshpark.com/shared_projects/1DoMmw6E

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: 2022/06/01 08:37 by donpdonp