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Simple PWM controller
=====================
`https://bues.ch/cgit/simplepwm.git/ <https://bues.ch/cgit/simplepwm.git/>`_
Simplepwm is a small PWM brightness controller for LED lamps.
Microcontroller
===============
Simplepwm supports the following microcontrollers. Not all features are supported on all microcontrollers. See the table for details.
============================ =========== ========= ========= ========= =========
.. ATMega-328P ATTiny-85 ATTiny-45 ATTiny-25 ATTiny-13
============================ =========== ========= ========= ========= =========
Number of analog pot. inputs 3 1 1 1 1
Number of PWM outputs 3 1 1 1 1
Battery power saving x x x
Battery voltage monitoring x x x
HSL color model x
Remote control via UART x
Debugging via UART x
============================ =========== ========= ========= ========= =========
Hardware schematics
===================
Schematics for ATMega based setups: `schematics-atmega/simplepwm-atmega.pdf <schematics-atmega/simplepwm-atmega.pdf>`_
Schematics for ATTiny based setups: `schematics-attiny/simplepwm-attiny.pdf <schematics-attiny/simplepwm-attiny.pdf>`_
Prebuilt firmware images
========================
The release archives of simplepwm contain prebuilt `.hex` files for all supported microcontrollers in the `hex` directory. These hex files can be flashed directly to the microcontroller with a any tool of your choice (e.g. Atmel Studio or avrdude).
The corresponding fuse settings can be found in the file `fuses.txt` in the same directory.
Building the firmware
=====================
The firmware build needs the following tool chain:
* Unix-like operating system
* GNU make
* AVR GCC
* AVR Binutils
* avrdude
Run the following commands to build the firmware:
.. code:: sh
cd firmware
make DEV=t85
Please specify the target microcontroller using the DEV variable as shown above.
Valid values are:
=============== ===========
Microcontroller make option
=============== ===========
ATTiny 13 `DEV=t13`
ATTiny 25 `DEV=t25`
ATTiny 45 `DEV=t45`
ATTiny 85 `DEV=t85`
ATMega 328P `DEV=m328p`
=============== ===========
Additional build options that can be passed to `make`:
=========== ====== ======= ================================================================
make option values default description
=========== ====== ======= ================================================================
PWM_LIM 1-100 100 Limit the maximum PWM duty cycle to this percentage.
PWM_INVERT 0-1 0 Invert the PWM output signal(s).
ADC_INVERT 0-1 0 Invert the ADC input signal(s).
ADC_HSL 0-1 1 Interpret the ADC input signals as HSL setpoints instead of RGB.
=========== ====== ======= ================================================================
Flashing the firmware after build
=================================
Run the following commands to flash the firmware to the target microcontroller:
.. code:: sh
cd firmware
make DEV=t85 print_fuses
make DEV=t85 write_fuses
make DEV=t85 write_mem
Or alternatively use any other of the available AVR flashing tools to program the .hex file and fuses.
License
=======
Copyright (c) 2018-2020 Michael Buesch <m@bues.ch>
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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