Mcu 0139-remote-433MHz-transmitter: Difference between revisions

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Bill of materials (PCB v1.3):
Bill of materials (PCB v1.3):


<pre>
* H34A transmitter module
0139 433mhz transmitter bill of materials


R1 1206 20k
* ATtiny85 SOIC
R2 1206 4k7
R3 1206 1k
R4 1206 10k
R5 1206 10k
R6 1206 10R
R7 1206 4k7


C1 1206 1uF
*
C2 1206 1uF
C3 1206 1uF
C4 1206 1uF


U1 SOIC ATTiny85
*
U2 TO-92 DS18B20
U3 SOT23-5 NCP718
U4 11x11mm H34A module

T1 SOT23 (N-Ch FET) BSS138 or Si2302DS
T2 SOT23 (P-Ch FET) NDS352AP or BSH203
T3 SOT23 (P-Ch FET) NDS352AP or BSH203

D1 1206 LED
</pre>

Revision as of 01:04, 28 December 2021

Home automation project sending telemetry using a low-cost ISM-band (433MHz) transmitter.


This is a change of plan from what I originally intended to use (the RFM69HW modules), but with several home automation solutions easily available I decided to make use of these modules instead.


This is the bare transmitter module.

H34A-module.jpg



Here is the transmitter module wrapped in heatshrink and stuck on top of an Arduino Nano

0139 Prototype-1 Arduino-nano.jpg


Making the overall form factor even smaller by contemplating putting it on a Digispark board.

0139 Prototype-2 Digispark ATtiny85.jpg

The benefit is that the ATtiny85 modules are fairly cheap and can hold up to 8kB of program memory. A quarter the size of the ATMega328 Arduino but probably still more than enough to send some telemetry.


This is the module fitted onto a custom PCB that has the ATtiny85 on the underside.

0139 Prototype-3 Attiny V1.0.jpg


Bill of materials (PCB v1.3):

0139 433mhz transmitter bill of materials

R1  1206  20k
R2  1206  4k7
R3  1206  1k
R4  1206  10k
R5  1206  10k
R6  1206  10R
R7  1206  4k7

C1  1206  1uF
C2  1206  1uF
C3  1206  1uF
C4  1206  1uF

U1  SOIC     ATTiny85
U2  TO-92    DS18B20 
U3  SOT23-5  NCP718
U4  11x11mm  H34A module

T1  SOT23  (N-Ch FET) BSS138 or Si2302DS
T2  SOT23  (P-Ch FET) NDS352AP or BSH203
T3  SOT23  (P-Ch FET) NDS352AP or BSH203

D1  1206   LED