Component	Type	Note	Marking
nRF52840	SoC	Main SoC, 1MB Flash, 256KB RAM	U1
ESP8266	WiFi SoC	2MB external Flash, running AT firmware	IC8
Quectel BG95-M3	LTE Modem with GPS	USB exposed to debug pads	M1
LIS3DH	Acceleration Sensor	Two units present	U2
LIS3DH	Acceleration Sensor	Two units present	U3
VEML6035	Light Sensor	Next to push button, used for wake-up	IC7
ENS210	Temperature + Humidity Sensor	-	IC3
TPL5010	Watchdog	needs to be fed	IC4
LPS22HB	Pressure Sensor	-	IC5
Red LED	LED	-	LED1
Green LED	LED	-	LED2
Button	Push Button	Wakes the device power off	SW1

What we know about the pins of the nRF52840 so far:

Pin	Description
0	!LED Green
1	!RED Green
2	Power Latch - High Z * High -> Stay on -> Low hard power off
3	NC
4	CS ACCL 2
5	NC
6	CS ACCL 1
7	NC
8	MISO
9	TPL5010 Wake input
10	TPL5010 Done output
11	Sensor VDD ? (C74 l)
12	SPI CLK
13	SCL
14	bridged to 16 and 18
15	SDA
16	bridged to 14 and 18
17	Modem Rxd GPIO
18	RESET
19	NC
20	connects to R29 R
21	NC
22	Modem Txd GPIO
23	NC
24	Connects to Q5 U R
25	NC
26	ACC U3 int ?
27	NC
28	NC
29	Modem + ESP power, switches the actual rail
30	NC
31	VBAT measurement ? (R48 b)
32	Uart logging Rxd (broken out gpio)
33	Uart logging Txd (broken out gpio)
34	Modem !pwrkey
35	NC
36	VEML6035 INT
37	NC
38	Switch input ?
39	NC
40	NC
41	MOSI
42	Wifi Rxd Baud 115200
43	Wifi Txd Baud 115200
44	NC
45	ESP power pin
46	NC
47	ESP GPIO 0