{"id":245,"date":"2019-11-17T13:18:45","date_gmt":"2019-11-17T13:18:45","guid":{"rendered":"https:\/\/dieter.dimo4u.de\/?page_id=245"},"modified":"2022-05-19T10:20:15","modified_gmt":"2022-05-19T09:20:15","slug":"weihnachtspyramide-dimmen","status":"publish","type":"page","link":"https:\/\/dieter.dimo4u.de\/?page_id=245","title":{"rendered":"Weihnachtspyramide dimmen"},"content":{"rendered":"
\"\"
Testaufbau mit externen 400Hz-Generator<\/figcaption><\/figure>\n

Das ist mein erstes Projekt nach dem Rentenstart. Die mit viel Engagement von den Kollegen gebaute Pyramide war einfach zu hell f\u00fcr die gem\u00fctliche Weihnachtsstimmung. \"\"<\/a>Da kam sofort die Idee, die LED-Lampen zu dimmen. Problem der Lampen ist nur, das da drin nur ein Vorschaltkondensator und die Gleichrichterbr\u00fccke ist. Also mu\u00df die Netzspannung runtergeregelt werden. Wenn man aber sich den Strom durch die LED’s anschaut, sieht man sofort, da\u00df die dann flimmern m\u00fcssen, weil nur noch in den Sinusspitzen Strom flie\u00dft.<\/p>\n

L\u00f6sung von mir:<\/h5>\n

mit Atmelcontroller ATTiny25 einen kleinen Sinusgenerator f\u00fcr 400Hz bauen, NF-Verst\u00e4rker (von Amazon 35W Digitalverst\u00e4rker) nachschalten und das Ausgangssignal an einen Netztrafo sekund\u00e4rseitig anschlie\u00dfen. Als Extra dann noch: ein Poti am Eingang vom NF-Verst\u00e4rker und schon ist die regelbare Sinusspannung 80 – 150V \/ 400Hz da. Stromversorgung aus den vorhandenen 24V-Schaltnetzteil.
Der Sinusgenerator erh\u00e4lt noch einen RC-Ausgangsfilter, damit es nicht soviel Oberwellen gibt (EMV).
Code von Sinusgenerator:<\/p>\n\n

\/*<\/span>\n<\/span><\/span> * main.c<\/span>\n<\/span><\/span> *<\/span>\n<\/span><\/span> *  Created on: 05.11.2018<\/span>\n<\/span><\/span> *      Author: Dieter<\/span>\n<\/span><\/span> *\/<\/span>\n<\/span><\/span>\/*<\/span>\n<\/span><\/span>Fuse set: Clock_div_8 aus (8MHz RC-Clock), Rest auf Standard-Einstellungen<\/span>\n<\/span><\/span>Pin 1\t\tReset (PB5)<\/span>\n<\/span><\/span>Pin 2\t\tPB3<\/span>\n<\/span><\/span>Pin 3\t\tPB4<\/span>\n<\/span><\/span>Pin 4\t\tGND<\/span>\n<\/span><\/span>Pin 5\t\tPB0<\/span>\n<\/span><\/span>Pin 6\t\tPB1<\/span>\n<\/span><\/span>Pin 7\t\tPB2<\/span>\n<\/span><\/span>Pin 8\t\tVCC<\/span>\n<\/span><\/span>*\/<\/span>\n<\/span><\/span>\n<\/span><\/span>#define F_CPU 8000000UL<\/span>\n<\/span><\/span>#include <avr\/pgmspace.h><\/span>\n<\/span><\/span>#include <avr\/io.h><\/span>\n<\/span><\/span>#include <stdint.h><\/span>\n<\/span><\/span>#include <util\/delay.h><\/span>\n<\/span><\/span>#include <math.h><\/span>\n<\/span><\/span>\n<\/span><\/span>uint8_t idx = 0<\/span>;\n<\/span><\/span>uint8_t sine[128<\/span>];\n<\/span><\/span>\n<\/span><\/span>int main(void) {\n<\/span><\/span>\/\/ Fill Sinus-Table<\/span>\n<\/span><\/span>\tfor<\/span> (uint8_t i = 0<\/span>; i < 128<\/span>; i++) \n<\/span><\/span>        {\n<\/span><\/span>           sine[i] = (uint8_t) (sin(i * 2<\/span> * 3.1415<\/span> \/ 128<\/span>) * 127<\/span> + 128<\/span>);\n<\/span><\/span>\t}\n<\/span><\/span>\tPORTB = 0b00000000<\/span>;\n<\/span><\/span>\tDDRB = (1<\/span> << PB1) | (1<\/span> << PB4);\n<\/span><\/span>\n<\/span><\/span>\tPLLCSR |= (1<\/span> << PLLE);\t\t\/\/ PLL starten<\/span>\n<\/span><\/span>\n<\/span><\/span>\/\/wait for PLL Lock<\/span>\n<\/span><\/span>\n<\/span><\/span>\twhile<\/span> (!(PLLCSR & (1<\/span> << PLOCK)))\n<\/span><\/span>\t;\n<\/span><\/span>\n<\/span><\/span>\tPLLCSR |= (1<\/span> << PCKE);\t\t\t\/\/ PLL_Clock = 64MHz<\/span>\n<\/span><\/span>\t\n<\/span><\/span>\tOCR1B = sine[idx & 0x7f<\/span>];\n<\/span><\/span>\tOCR1A = sine[(idx + 32<\/span>) & 0x7f<\/span>];\n<\/span><\/span>\n<\/span><\/span>\/\/Timer1 \/2 PWM 1A\t\tTimer1_Clock = 32MHz; PWM-Takt = 125KHz<\/span>\n<\/span><\/span>\/\/ Enable PWM on PB1 (Pin 6)<\/span>\n<\/span><\/span>\tTCCR1 = (1<\/span> << CS10) | (1<\/span> << PWM1A) | (1<\/span> << COM1A1);\n<\/span><\/span>\n<\/span><\/span>\/\/Enable PWM on PB4 (Pin 3)<\/span>\n<\/span><\/span>\tGTCCR = (1<\/span> << PWM1B) | (1<\/span> << COM1B1);\n<\/span><\/span>\t_delay_us(500<\/span>);\t\t\/\/ 500\u00b5s warten, damit sich Ausgangsfilter einschwingen<\/span>\n<\/span><\/span>\t\n<\/span><\/span>\/\/ Schleife f\u00fcr 128 Punkte der Sinuskurve in PWM programmieren\t<\/span>\n<\/span><\/span>\twhile<\/span> (1<\/span>) \n<\/span><\/span>\t{\n<\/span><\/span>\tOCR1B = sine[idx & 0x7f<\/span>];\n<\/span><\/span>\tOCR1A = sine[(idx + 32<\/span>) & 0x7f<\/span>];\n<\/span><\/span>\tidx++;\n<\/span><\/span>\t_delay_us(16<\/span>);\t\t\t\/\/ 400Hz<\/span>\n<\/span><\/span>\/\/\t_delay_us(500);\t\t\t\/\/ 15Hz<\/span>\n<\/span><\/span>\/\/\t_delay_us(151);\t\t\t\/\/ 50Hz<\/span>\n<\/span><\/span>\/\/\tohne delay\t\t\t\/\/ 2.2KHz<\/span>\n<\/span><\/span>\/\/\tohne delay\tund OCR1A\t\/\/ 3.8KHz<\/span>\n<\/span><\/span>\t}\n<\/span><\/span>}\n<\/span><\/span>\n<\/span><\/span><\/code><\/span>Code-Sprache:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>","protected":false},"excerpt":{"rendered":"
Das ist mein erstes Projekt nach dem Rentenstart. Die mit viel Engagement von den Kollegen gebaute Pyramide war einfach zu hell f\u00fcr die gem\u00fctliche Weihnachtsstimmung. Da kam sofort…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-full-width.php","meta":{"footnotes":""},"class_list":["post-245","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=\/wp\/v2\/pages\/245","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=245"}],"version-history":[{"count":29,"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=\/wp\/v2\/pages\/245\/revisions"}],"predecessor-version":[{"id":548,"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=\/wp\/v2\/pages\/245\/revisions\/548"}],"wp:attachment":[{"href":"https:\/\/dieter.dimo4u.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}