Board_build.f_cpu has no affect

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Hi,
I am trying to reduce the power consumption of an IoT-project based on a Wemos D1 mini, therefore I heard lowering the CPU frequency would help.
So I tried adding board_build.f_cpu but it seems like there is no affect on the cpu frequency.

Searching the internet I only found this topic with no solution.

by the way I am open to other suggestions to reduce the power consumption other than sleep and lower cpu frequency.

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That topic is for the ESP32, so probably not very relevant to an ESP8266 Wemos D1 Mini.

What did you specify when you were setting board_build.f_cpu? I was using the following as part of some testing of an issue in the ESP8266Arduino core a few weeks ago, and it was working then…

i.e. to switch between 80 and 160Mhz…

[env:d1_mini_80Mhz]
board = d1_mini
board_build.f_cpu = 80000000L

[env:d1_mini_160Mhz]
board = d1_mini
board_build.f_cpu = 160000000L

With the following in the code to check if the speed was correctly set…

Serial.printf("CpuFreqMHz: %u MHz\n", ESP.getCpuFreqMHz());
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