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Recent content on Die wunderbare Welt von Isotopp
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Athom CO2 Sensors
https://blog.koehntopp.info/2025/08/12/athom-co2-sensor.html
Published: August 12, 2025 01:02
Cheap and integrated CO2 sensors are finally available. I got mine from Athom . They cost $25 per device. The device uses an ESC32C3 (4M) as a foundation and sports a Sensirion SCD 40. It does measure CO2 in range from 400-2000 ppm with 5% accuracy…
Two Years Megane
https://blog.koehntopp.info/2025/08/10/two-years-megane.html
Published: August 10, 2025 01:02
It has now been two years since we got the Megane e-Tech . Renault Megane e-Tech parked in Zandvoort aan Zee at the beach promenade in rainy weather. The car uses Google Automotive Services (GAS). It is basically an Android with a really big…
Modern PHP (8.x)
https://blog.koehntopp.info/2025/07/30/modern-php-2.html
Published: July 30, 2025 06:07
I have not been doing PHP in a long time, and so I am writing this here as a memo to self, in order to remind me what features are “new” in PHP, with “new” meaning 7.0 and newer. Here is the 8.x edition. Features PHP…
Modern PHP (7.x)
https://blog.koehntopp.info/2025/07/30/modern-php.html
Published: July 30, 2025 03:04
I have not been doing PHP in a long time, and so I am writing this here as a memo to self, in order to remind me what features are “new” in PHP, with “new” meaning 7.0 and newer. Features PHP version Category …