ESPesh

ESPesh is a super tiny board designed for IoT applications. My plan is to use it as a BLE Mesh for IoT sensors and switches, because with BLE the power consumption is less than 1mA.

Features

• ESP32-PICO-D4
• Low power design (LDO, removed unnecessary components)
• Only one inch PCB
• USB C (only for power, not programming)
• LiPO battery (with charger and voltage protections)
• Some GPIOs exposed (I2C included)

BOM

I mainly use JLCPCB and LCSC for PCB and components.

Component	Quantity	Link	Price
ESP32-PICO-D4	1	https://lcsc.com/product-detail/Others_Espressif-Systems-ESP32-PICO-D4_C193707.html	$4.34
PRO-OB-440	1	https://www.digikey.es/product-detail/es/proant-ab/PRO-OB-440/1532-1001-1-ND/4895684	$0.95
LIR2450	1	https://es.aliexpress.com/item/32853897751.html	$2.76
0.1uF	3	https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_SAMSUNG_CL10B104KA8NNNC_100nF-104-10-25V_C1590.html	$0.29
2.7pF	1	https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_SAMSUNG_CL10C2R7CB8NNNC_2-7pF-2R7-0-25pF-50V_C16149.html	$0.61
4.7pF	1	https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_SAMSUNG_CL10C4R7CB8NNNC_4-7pF-4R7-0-25pF-50V_C57140.html	$0.405
10uF Tantalum	2	https://lcsc.com/product-detail/Tantalum-Capacitors_AVX_TAJA106K010RNJ_10uF-106-10-10V_C7177.html	$0.2386
10uF	1	https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_SAMSUNG_CL10A106KP8NNNC_10uF-106-10-10V_C19702.html	$0.52
LED 0603	1	https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_Red-LED-SMDLED-80-100mcd_C84263.html	$0.64
SK6805	1	https://es.aliexpress.com/item/32903030496.html	$3.23
MBR0520	1	https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_Changjiang-Electronics-Tech-CJ-MBR0520_C77335.html	$0.56
FDN340P	1	https://lcsc.com/product-detail/MOSFET_ON-Semicon_FDN340P_ON-Semicon-ON-FDN340P_C75469.html	$0.1241
1.6nH	1	https://lcsc.com/product-detail/Others_GOOGLL-GGW0603UC1N6KGT_C343064.html	$0.0310
10K	2	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF1002T5E_C25804.html	$0.1
6.8K	2	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF6801T5E_C23212.html	$0.1
2K	1	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF2001T5E_C22975.html	$0.1
5K1	2	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF5101T5E_C23186.html	$0.1
43K	1	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF4302T5E_C23172.html	$0.11
100R	1	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF1000T5E_C22775.html	$0.11
100K	1	https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_Uniroyal-Elec-0603WAF1003T5E_C25803.html	$0.1
SPX3819M5-L-3-3	1	https://lcsc.com/product-detail/Low-Dropout-Regulators-LDO_EXAR_SPX3819M5-L-3-3-TR_SPX3819M5-L-3-3-TR_C9055.html	$0.1225
SL4054ST25P	1	https://lcsc.com/product-detail/Others_TECHFUSE-SL4054ST25P_C258510.html	$0.509
XB6566H0	1	https://lcsc.com/product-detail/Others_XB6566H0_C190847.html	$0.1734
HDC1080	1	https://lcsc.com/product-detail/Humidity-Moisture-Sensors_TI_HDC1080DMBR_HDC1080DMBR_C82227.html	$1.1216
HRO-TYPE-C-31-M-12	1	https://lcsc.com/product-detail/USB-Type-C_Korean-Hroparts-Elec-TYPE-C-31-M-12_C165948.html	$0.3882
		TOTAL	$17.7334

Take in account that some components must be ordered in larger batches that the quantity needed (for example: SK6805: we need only one, but min order is 10).

Todos

• Wiki
• Test the board
• Sell it on Tindie so I can keep developing such tiny boards

License

Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

Open Source, Hell Yeah!