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| en:iot-open:practical:hardware:sut:esp32:emb8_1 [2024/03/04 09:38] – [Prerequisites] pczekalski | en:iot-open:practical:hardware:sut:esp32:emb8_1 [2024/04/09 13:03] (current) – [Steps] pczekalski |
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| When booking a device, ensure the LED stripe is visible in the camera. | When booking a device, ensure the LED stripe is visible in the camera. |
| <note important>Due to the low camera dynamics, do not use the full brightness of the LEDs: off is equivalent to 0, and the full brightness of the colour is 255 (8-bit resolution, per colour). We suggest to use up to 60 or max 100.</note> | <note important>Due to the low camera dynamics, do not use the full brightness of the LEDs: off is equivalent to 0, and the full brightness of the colour is 255 (8-bit resolution, per colour). We suggest to use up to 60 or max 100.</note> |
| <note tip>Because of the camera characteristic and human eye characteristics, the same numerical brightness for one colour can bring much different effect in another, so setting up 60 to channel Red will have different overall experienced brightness than setting 60 to channel Blue or Green. It is natural.</note> | <note tip>Because of the camera and human eye characteristics, the same numerical brightness set for one colour can bring a much different brightness experience on another, so setting up 60 to channel Red will have a different overall experienced brightness than setting 60 to channel Blue or Green.</note> |
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| ==== Steps ==== | ==== Steps ==== |
| stripe.show(); //Writes colours to the LED stripe | stripe.show(); //Writes colours to the LED stripe |
| </code> | </code> |
| Parameters are: ''setLedColorData(int index, u8 r, u8 g, u8 b);''. Note that the index is 0-based, so for our stripe valid, the indexes are 0..7. | Parameters are: ''setLedColorData(int index, u8 r, u8 g, u8 b);''.\\ |
| | <note tip>Note that the index is 0-based, so in the case of our device, valid indexes are 0...7.</note> |
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| If you want to set all LEDs in the stripe to the same colour, there is a handy function: ''setAllLedsColorData(u8 r, u8 g, u8 b);''. Remember to use the ''show();'' function afterwards. | If you want to set all LEDs in the stripe to the same colour, there is a handy function: ''setAllLedsColorData(u8 r, u8 g, u8 b);''. \\ Remember to use the ''show();'' function afterwards. |
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| ==== Result validation ==== | ==== Result validation ==== |
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| ===== FAQ ===== | ===== FAQ ===== |
| **I cannot see the colour via the video camera**: Try to lower brightness. | **I cannot see the colour via the video camera - everything looks white...**: Try to lower the LED's brightness. |
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| | <WRAP noprint> |
| ===== Project information ===== | ===== Project information ===== |
| {{:en:iot-open:logo_iot_200_px.png?200|}}\\ | {{:en:iot-open:logo_iot_200_px.png?200|}}\\ |
| {{:en:iot-open:ccbync.png?100|}} | {{:en:iot-open:ccbync.png?100|}} |
| </figure> | </figure> |
| | </WRAP> |
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