This is an Another great LCD display compatible with Gadgeteer module with limited pin resources, your project will quickly run out of resources using normal LCDs.
The CD4071BM, CD4072BM and CD4075BM OR Gates provide the system designer with direct implementation of the positive-logic OR function and supplement the existing family of CMOS gates.
The XL4015 is a Buck Converter DC DC Step Down Converter 5V-32V To 0.8V-30V 5A 75W. This product is a 180 KHz fixed frequency PWM DC/DC module, capable of driving a 5A load with high efficiency, low ripple and excellent line & load regulation.
The MT8870 DTMF Audio/Speech Decoding Telephone Module is commonly used to control robots with a mobile phone, it is also used in different kinds of home automation projects where mobile dial pad input is required.