PandaZHU/M4 use ESP32 as the MCU for 3D printer.while PandaM4 is designed for drop in Creality ender printer.

With ESP32 for 3D printer,not only fast MCU speed,large memory than all the STM32bit board,you can upload file, firmware over the air and more possible.

Powerful:

1. it has larger memory and more powerful than normal 32bit motherboard.Two 240MHz MCU,4MB memory
2. support 8 motor drivers and three heaters (PandaZHU) with one fast expand GPIO chip.
3. the speed of uploading gcode file is 10 times faster than it as a wifi module.
4. play music(mp3/wav) when printer boot or printing finished...
5. Not only Marlin, you can easily run Grbl_ESP32 (CNC controller)

Easy to use with ESP3D:

1. upload marlin firmware through wifi with browser.
2. upload gcode file, configure printer and control printer wireless with browser.

Items	Specifications
MCU	Two 32-bit MCU ,240MHz
RAM	520 KBytes SRAM
ROM	4M Bytes Flash memory
EXGPIO	there are 24 more GPIOs(only as output) with a expander, the communication speed is 1.4MHz.
WiFi	802.11 b/g/n/d/e/i/k/r (802.11n up to 150 Mbps),Bluetooth v4.2
temperature	support 3 thermistors (30degree~280degree)
Bed leveling	BLtouch/ support wild range voltage 5V~36V Inductive sensor NPN, since it have optocoupler.
LCD	LCD128*64/PandaTouchScreen/DGUS touch screen
RJ11	for DGUS touch screen
Serial chip	CH340G
Input	9~28V 20A max
heater Output	3 heaters, 15Amax for each heater (100A mosfet PSMN1R0-30YLC)
stepper driver	8 drviers(TMC2209/TMC2208/A4988),9 motor connectors(Z0_A and Z0_B are connected to the same driver)
FAN	Support mixed use of 5V/24V fans,3 of them are controllabe fans
Audio	play music at boot, Error/alarm music..
OS	Real-time operating systems (RTOS)
App	control printer, upload files with web browser ,see more

Boards compare

Name	Creality	SKR MINI E3	SKR Octopus	SKR E3 RRF	FYSETC E4	PandaM4	PandaZHU
MCU	Atmega 1284	STM32F103	STM32F446	STM32F407	ESP32	ESP32	ESP32
MCU Bits	8bit	32bit	32bit	32bit	32bit	32bit	32bit
Frequency	20 MHz	72 MHz	180 MHz	168 MHz	240 MHz	240 MHz	240 MHz
Flash	128KB	256KB	512KB	1MB	4MB	4MB	4MB
RAM	16KB	48KB	128KB	196KB	520KB	520KB	520KB
ADC	10bit	12bit	12bit	12bit	12bit	12bit	12bit
Heaters	2	2	4	2	2	2	3
Stepper drivers	4	4	8	4	4	4	8
Display	LCD12864	LCD12864 Touchscreen	LCD12864 Touchscreen	LCD12864 Touchscreen	no	LCD12864 Touchscreen	LCD12864 Touchscreen
BLTOUCH	no	yes	yes	yes	no	yes	yes
Play audio	no	no	no	no	no	wav/mp3	wav/mp3
Wifi speed,Test by uploading file	4KB/s Wifi module	4KB/s Wifi module	4KB/s Wifi module	4KB/s Wifi module	>50KB/s Native wifi	>50KB/s Native wifi	>50KB/s Native wifi
Chip supply	sufficient	shortage	shortage	shortage	sufficient	sufficient	sufficient

There are still some space to improve the wifi speed of ESP32 as MCU by optimizing the software.

PinMap

Name	PandaZHU_PIN	PandaM4_PIN		Name	PandaZHU_PIN	PandaM4_PIN
X_Endstop	4	4		Y_Endstop	35	35
Z_Endstop	21	21		SERVO(BLTOUCH PWM)	0	0
X_Step	101	101		X_Dir	100	100
Y_Step	103	103		Y_Dir	102	102
Z_Step	105	105		Z_Dir	104	104
E0_Step	107	107		E0_Dir	106	106
E1_Step	115	None		E1_Dir	114	114
E2_Step	112	None		E2_Dir	113	None
E3_Step	110	None		E3_Dir	111	None
E4_Step	121	None		E4_Dir	122	None
X_ENABLE	128	115		Y_ENABLE	128	114
Z_ENABLE	128	113		E0_ENABLE	128	112
E1_ENABLE	128	None		E2_ENABLE	128	None
E3_ENABLE	128	None		E4_ENABLE	128	None
Heater Bed	109	109		Heater_Hotend0	108	108
Heater_Hotend1	123	None
Fan0	118	118		Fan1	119
Fan2	120	120
Bed Thermistor	36	36		Hotend0 Thermistor	39	39
Hotend1 Thermistor	34	None
Filament Runout	22	22		RGB light	15	15
DHT11	13	13
LCD_BTN	32	32		LCD_BTN1	33	33
LCD_BTN2	25	25		LCD_RS	27	27
LCD_ENABLE	26	26		LCD_D4	14	14
Beeper	129	129
SD_MOSI	23	23		SD_MISO	19	19
SD_SCK	18	18		SDSS	5	5
SD_DETECT	2	2
SPEAKER	25	25

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