The calculations used in the example code should only be considered when operating at lambda levels near λ 1. Using this approximation outside the intended area of operation will result in a proportional error. The following table shows the accuracy between λ 0.750 and λ 10.119.
The calculation should be used for educational purposes and the accuracy is adequate when operating near λ 1. When measuring at much leaner or richer gases an improved method of converting the CJ125 output voltage is needed. A lookup table have been implemented to the example code to correct this error.
Support forum for the Lambda Shield designed to connect Bosch LSU 4.9 wideband oxygen sensors to Arduino projects.
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