Tiny-BCU - Revision history

Konnekting: /* Requirements */

2018-03-16T14:51:29Z

Requirements

Konnekting at 14:49, 16 March 2018

2018-03-16T14:49:42Z

Konnekting: Created page with "= Idea = * BCU without ready-to-use KNX Transceiver like OnSemi, Siemens or Elmos * Small µC that reads/writes the bits to KNX bus and * "emulates" a reduced KNX TPUART BCU..."

2018-03-16T12:43:18Z

Created page with "= Idea = * BCU without ready-to-use KNX Transceiver like OnSemi, Siemens or Elmos * Small µC that reads/writes the bits to KNX bus and * "emulates" a reduced KNX TPUART BCU..."

New page

= Idea =

* BCU without ready-to-use KNX Transceiver like OnSemi, Siemens or Elmos
* Small µC that reads/writes the bits to KNX bus and
* "emulates" a reduced KNX TPUART BCU protocol

= Requirements =

* Transceiver-Part: something to read/write the bits physically from/to KNX bus
* Controller-Part: something that can interpret the bits from transceiver and make it BCU-style readable + write the bits of a telegram to the transceiver
* Supply-Part: voltage and current from bus: at least 3.3V and 5V with about >=50mA, without creating interferrences on the BUS

= Transceiver-Part =

See: https://github.com/selfbus/hardware-incubation/tree/master/module/UPModule

= Supply-Part =

See: https://github.com/selfbus/hardware-incubation/tree/master/module/UPModule
For instance one can also use the "Polulu" step-down modules to create 3.3V and 5V from up to 40V input. The are multiple candidates available, f.i. from TI

= Controller-Part =

Something like the Attiny85.

Features:

* Interrupt-Pin: https://hoeser-medien.de/2015/04/attiny85-interrupt-basierend-auf-pinchange-interrupt-library/
* UART via softserial
* ultra low power
* small and also in DIP available --> easy to solder. Even with socket one can remove the chip to program it.

Open questions: How to debug? Maybe develop with Arduino UNO and then port to attiny?

SW: See: https://github.com/selfbus/software-arm-lib/tree/master/sblib/inc/sblib/eib

@@ Line 21: / Line 21: @@
 = Requirements =
-* Transceiver-Part: something to read/write the bits physically from/to KNX bus
+* Transceiver-Part: something to read/write the bits physically from/to KNX bus; simple analog circuit for extracting/inserting the bits from/to bus.
-* Controller-Part: something that can interpret the bits from transceiver and make it BCU-style readable + write the bits of a telegram to the transceiver
+* Controller-Part: something that can interpret the bits from transceiver-part and make it BCU-style readable + write the bits of a telegram to the transceiver-part
 * Supply-Part: voltage and current from bus: at least 3.3V and 5V with about &gt;=50mA, without creating interferrences on the BUS

@@ Line 4: / Line 4: @@
 * Small µC that reads/writes the bits to KNX bus and
 * "emulates" a reduced KNX TPUART BCU protocol
 = Requirements =