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DTMF SHIELD
DTMF shield for Arduino. Enables remote control via phone keypad tones for automation and security projects.
Description
The DTMF Shield is a communication and control expansion board designed for Arduino and microcontroller-based projects that require Dual Tone Multi Frequency (DTMF) signal decoding. It enables devices to be remotely controlled via phone calls or GSM modules by interpreting keypad tones. Commonly used in remote switching, home automation, security systems, and industrial control, the DTMF Shield offers reliable decoding and easy integration. Its shield form factor allows quick plug-and-play connection with Arduino boards, making it ideal for students, hobbyists, and DIY automation projects.
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Text to Speech TTL Module (Serial to Speech)
-  Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes
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