Eval » Historie » Version 7
Maximilian Seesslen, 20.04.2023 14:08
| 1 | 1 | Maximilian Seesslen | h1. Eval |
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| 3 | h1. Overall design |
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| 5 | * 4 x red+green LEDs for condition |
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| 6 | * Restart button |
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| 7 | 4 | Maximilian Seesslen | * Rotate over the ADC channels and get Voltage level |
| 8 | * draw 100mA |
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| 9 | * Die Kabel haben AWG28, 212.9 Ohm/km, 1.4 A nach erde, 0.23 A versorgung |
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| 10 | 7 | Maximilian Seesslen | * 0,2129 Ohm/m; 1,0645 Ohm/5m; 2,129 Ohm/10m; |
| 11 | 4 | Maximilian Seesslen | * https://de.wikipedia.org/wiki/E-Reihe#/media/Datei:E12_values_graph.svg |
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| 13 | U2=((U*R2)/R_GES) |
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| 15 | 5 | Maximilian Seesslen | U |
| 16 | 4 | Maximilian Seesslen | R*I |
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| 18 | 5V/0,1A= 50 Ohm |
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| 19 | 5V*0,1A= 0,5 W |
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| 21 | 7 | Maximilian Seesslen | 5V/0,5A= 10 Ohm |
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| 23 | 4 | Maximilian Seesslen | RGes = R1+R2 = 50 |
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| 25 | 1 | Maximilian Seesslen | 3V=(5*R2)/50 |
| 26 | 5 | Maximilian Seesslen | R2 = (3*50)/5 = 30 -> 27 |
| 27 | R1 = 22 |
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| 28 | RGES = 49 |
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| 29 | |||
| 30 | U2 = 5*27/49 = 2,755102 |
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| 31 | 7 | Maximilian Seesslen | |
| 32 | theoretically an device that draws 0,1A and 5m: |
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| 33 | U2=((5*50)/ (50+1,0645) ) = 4,8957691; that should work |
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| 35 | theoretically an device that draws 0,5A and 10m: |
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| 36 | U2 = ( (5*10) / (10+2,129) ) = 4,1223514 V |
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| 39 | 1 | Maximilian Seesslen | |
| 40 | h1. MCU |
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| 41 | 2 | Maximilian Seesslen | |
| 42 | * "stm32f051c4":https://www.mouser.de/datasheet/2/389/stm32f051c4-1851079.pdf |
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| 43 | ** I have 17; |
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| 44 | 3 | Maximilian Seesslen | ** 16 ADC channels |
| 45 | 6 | Maximilian Seesslen | * STM32G030C8T6 |
| 46 | ** nearly same specs but smaller footprint; LQFP 48 |