(GPIO16 needs to be tied to RST to wake from deepSleep.) The chip can sleep for at most ESP.deepSleepMax() microseconds. mode is one of WAKE_RF_DEFAULT, WAKE_RFCAL, WAKE_NO_RFCAL, WAKE_RF_DISABLED. However, I also had an LCD, a Seiko M1602, that had a two line pin lay-out for which i made a dedicated version.įor the program I use the LCD library from Malpartida.Some ESP-specific APIs related to deep sleep, RTC and flash memories are available in the ESP object.ĮSP.deepSleep(microseconds, mode) will put the chip into deep sleep. The stripboard version follows the standard lay-out for most LCDs with a SIL pin lay-out. I am using a 74164 shift register with only a few additional components to do what I need and it can easily be put on a piece of stripboardīOM 74LS164 1N4148 2x1k resistor 1x1k variable resistor In that case using a shift register can be a solution. when u need al analog ports and cant sacrifice A4 and A5 for SDA and SCL. Although it is possible to use an I2C module to control the LCD with two wires via the I2C port, there are situations in which that is unpractical, e.g.
Using the LCD in 4 bit mode saves 4 pins, but often that is not enough. LCD's generally need 11signal lines + 3 or 5 lines for Vcc, ground and contrast and in some cases an extra 2 for background light.
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