First Impressions
Seems pretty easy to open up. One philips screw from the front. (Needs a skinny screwdriver tho...)
First thing you see is the important part (From a hacking viewpoint).
There're actually 2 boards with a 4x2 interconnect.
All the power stuff is on the one on the right.
The one on the left is the WiFi & RF board.
Notes
There are 4 chips on the WiFi & RF board:
| Label
|
Part
|
Notes
|
| U1
|
Eastsoft ES7P001FGSA GS34BFN404
|
8-bit MCU?
|
| U2
|
590R 1933
|
Probably the RF chip
|
| U3
|
BB10 F8G A01J1J 1939 A
|
8-bit MCU
|
| U5
|
ESP8285
|
|
There are 7 test points immediately accessible on the board:
| Label
|
Signal
|
ESP
Pin
|
Notes
|
| TP3
|
EXT_RSTB
|
32
|
Possibly useful for reset when flashing?
|
| 5
|
GPIO5
|
24
|
|
| 4
|
GPIO4
|
16
|
|
| 0
|
GPIO0
|
16
|
|
| 6
|
GPIO2
|
14
|
|
| RX
|
UORXD
|
25
|
Also connected to U3 pin 17 via 0Ω resistor R16
|
| TX
|
UORXD
|
26
|
Also connected to U3 pin 18 via 0Ω resistor R15
|
J1 seems to connect to U3.
| Pin
|
Label
|
|
|
|
| 1
|
3v3
|
|
|
toward edge
|
| 2
|
C2CK
|
U3
|
5
|
|
| 3
|
C2D
|
U3
|
6
|
|
| 4
|
GND
|
|
|
toward centre
|
J4 connexts to RX & TX on the ESP chip.
| Pin
|
Label
|
|
|
|
| 1
|
3v3
|
|
|
toward edge
|
| 2
|
E-RX
|
U5
|
25
|
|
| 3
|
E-TX
|
U5
|
26
|
|
| 4
|
GND
|
|
|
toward centre
|
The interconnect to the power board:
| Label
|
Pin #
|
Label
|
Connects to
|
|
| GND
|
1
|
|
BUZZER
|
U3 pin 1
|
toward centre
|
| GND
|
|
|
ZERO_CROSS
|
U3 pin 20
|
|
| GND
|
|
|
CONTROL
|
U3 pin 13
|
|
| 3v3
|
|
|
3v3
|
|
toward edge
|
There are 2 switch locations on the board.
S1 is un-populated but seems to be for a push-button on the ESP chips GPIO0 pin.
S2 is a slide switch labelled "OTA" (Not the default position...). This switch appears to be accessible through a small slot in the front cover of the unit.
Links
Tasmota - Issues - #7598 - Support for Sonoff D1 Dimmer
