Added notes on Zemismart curtain motor

TuyaMCU.md

@@ -237,3 +237,46 @@ TIP: You can configure all in one go using `backlog TuyaMCU 12,2; TuyaMCU 13,3;
 #### Configure power metering
 
 Power metering configuration is same as for dimmers. Check the power metering section for dimmers.
+
+### Setting up Curtain Motor
+The Zemismart WiFi curtain motor uses a Tuya TYWE1S inside the little white dongle as a radio modem.
+`U1TX` is connected to "USB D+", `U1RX` is connected to "USB D-", and there is a blue LED in the dongle connected to "USB3 R-" controlled by the MCU.
+To flash Tasmota, we need `U0RX`, `U0TX`, and `GPIO0`. None of which are broken out on the pcb, so soldering or Tuya-convert are useful.
+
+The stock Tuya App communicates with the PIC Micro inside the motor housing at 9600 8N1. 
+* `dpId 101` is the "partial open/partial close" command with a 4 byte field of 0-100%. 
+* `dpId 102` is a "fully open/fully close" command with a 1-byte Boolean field. 
+* `dpId 103` is unknown.
+
+#### Debugging
+```
+55 aa 00 06 "deliver dp" 0005 "len=5" 66 04 00 01 <00=close100%,01=open0%> <chksum> is the fully open/close command
+07 "report dp" 0005 (len) 66 04 00 01 <00 or 01> <chksum> is the reply.
+```
+```
+55 aa 00 06 "deliver dp" 0008 (len=8) 65 02 00 04  <value.32 <chksum> is the move partial command
+55 aa 00 07 "report dp" 0008 (len=8) 65 02 00 04 <value.32> <chksum> is the reply. 
+there may first be a reply of 65 02 00 04 <oldvalue.32> <chksum> before the motor engages
+```
+
+#### Tasmota
+1. `module 54` # TuyaMCU
+2. \# check or change GPIO assignments (need to double check this bit)
+3. `tuyamcu 21,101` # declare curtain as a dimmer
+4. \# no idea what a good tuyamcu xx,102 is
+5. \# no idea what a good tuyamcu xx,103 is
+6. `setoption 69 0` # allow dimmer below 25% or 10%.
+
+With these settings, the `dimmer` command can adjust the curtain from 100% (closed) to 1% (almost fully open, 0% is the motor limit, but 1% is the Tasmota limit?)
+
+#### Things that did not work
+```
+tuyamcu 1,102 # make 0x66 a button
+tuyamcu 1,103 # make 0x67 a button
+```
+Having 0x66 declared a button caused the motor to oscillate - open part way and then close again. Like Tasmota was sending the "fully open" command and then immediately cancelling it with a "partial close" command.
+```
+tuyamcu 11,102 # make 0x66 a relay
+tuyamcu 11,103 # make 0x67 a relay
+```
+Does not appear to have any impact on the curtain