Eval » Historie » Version 11
Maximilian Seesslen, 20.04.2023 18:29
| 1 | 1 | Maximilian Seesslen | h1. Eval |
|---|---|---|---|
| 2 | |||
| 3 | h1. Overall design |
||
| 4 | |||
| 5 | * 4 x red+green LEDs for condition |
||
| 6 | * Restart button |
||
| 7 | 10 | Maximilian Seesslen | * Iterate over the ADC channels and get Voltage level |
| 8 | 4 | Maximilian Seesslen | * draw 100mA |
| 9 | * Die Kabel haben AWG28, 212.9 Ohm/km, 1.4 A nach erde, 0.23 A versorgung |
||
| 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 |
| 12 | 9 | Maximilian Seesslen | * Buzzer would be nice for indication; durchklingeln |
| 13 | * PWM Output |
||
| 14 | 11 | Maximilian Seesslen | * Pinsocket connected to wires to measure resistance/Voltage directly |
| 15 | 4 | Maximilian Seesslen | |
| 16 | U2=((U*R2)/R_GES) |
||
| 17 | |||
| 18 | 5 | Maximilian Seesslen | U |
| 19 | 4 | Maximilian Seesslen | R*I |
| 20 | |||
| 21 | 5V/0,1A= 50 Ohm |
||
| 22 | 5V*0,1A= 0,5 W |
||
| 23 | |||
| 24 | 7 | Maximilian Seesslen | 5V/0,5A= 10 Ohm |
| 25 | |||
| 26 | 4 | Maximilian Seesslen | RGes = R1+R2 = 50 |
| 27 | |||
| 28 | 1 | Maximilian Seesslen | 3V=(5*R2)/50 |
| 29 | 5 | Maximilian Seesslen | R2 = (3*50)/5 = 30 -> 27 |
| 30 | R1 = 22 |
||
| 31 | RGES = 49 |
||
| 32 | |||
| 33 | U2 = 5*27/49 = 2,755102 |
||
| 34 | 7 | Maximilian Seesslen | |
| 35 | theoretically an device that draws 0,1A and 5m: |
||
| 36 | U2=((5*50)/ (50+1,0645) ) = 4,8957691; that should work |
||
| 37 | |||
| 38 | theoretically an device that draws 0,5A and 10m: |
||
| 39 | 1 | Maximilian Seesslen | U2 = ( (5*10) / (10+2,129) ) = 4,1223514 V |
| 40 | 10 | Maximilian Seesslen | |
| 41 | h1. Keyfeatures |
||
| 42 | |||
| 43 | * Cable checker |
||
| 44 | * Buzzer Durchgangspruefer |
||
| 45 | * PWM Output |
||
| 46 | 7 | Maximilian Seesslen | |
| 47 | 1 | Maximilian Seesslen | h1. MCU |
| 48 | 2 | Maximilian Seesslen | |
| 49 | * "stm32f051c4":https://www.mouser.de/datasheet/2/389/stm32f051c4-1851079.pdf |
||
| 50 | ** I have 17; |
||
| 51 | 3 | Maximilian Seesslen | ** 16 ADC channels |
| 52 | 1 | Maximilian Seesslen | * STM32G030C8T6 |
| 53 | 6 | Maximilian Seesslen | ** nearly same specs but smaller footprint; LQFP 48 |
| 54 | 8 | Maximilian Seesslen | ** 2,68€ inc. Mwst. |