Single-chip Smart Water Meter with Dual-band RF and InfraRed port

Hundreds of millions mechanical water meters are deployed around the world today. Market pressure pushes water utilities to add intelligence and allow for automated readout and billing on top of water waste control. RF-enabled electronic flow measurement modules provide a cost-effective solution without full meter replacement and are the main building block for fully electronic smart water meters with impeller principle.

This training session will cover four key sub-systems for converting mechanical water and heat meters into a smart meter. The inductive or LC-sensing rotation detection implementation for flow measurement is using the TI’s SimpleLink™ CC1350 Wireless MCU and CSD23280F3 FemtoFET™. The Dual-band wireless and InfraRed LED communications as well as the innovative SW GPIO control of 7-segment LCDs utilize CC1350 internal hardware resources. All four sub-systems have been optimized for ultra-low power consumption to enable product lifetime longer than 10 years with a single primary battery cell.

1. Introduction to mechanical water meters and EN ISO 4064

This section covers the basics of mechanical water meters and the principle of operation for impeller based water meters. There are multiple standards for water meters around the world; the EN ISO 4064 is relevant to all European countries and has been adopted under a different name in some other regions as well.

# Title Duration
1.1 Single-chip Smart Water meter with Dual-band RF link and InfraRed port
RF-enabled electronic flow measurement modules with LC-sensing provide a cost-effective solution for upgrading existing mechanical water meters with i...
1.2 EN ISO 4064 requirements for water meters
The EN ISO 4064-1 thru -6 standard documents define all relevant parameters for cold and hot water meters and how the testing of water meters should be...
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2. Inductive sensing with TI FemtoFET and CC1350 Wireless MCU

Water and heat meters share multiple system building blocks, such as the metrology sub-system and the application sub-systems, the Wireless communications part, the InfraRed optical port or the power solution. In this section, we will cover a new ultra-low cost single-chip LC-sensing solution utilizing the CC1350 Wireless MCU and its Sensor Controller Engine. Two external LC-tanks with a TI FemtoFET device each implement two rotation detection sensors, which measure the rotation of a half-metal/half-nonmetal disc, often used in mechanical water meters. The full solution is named TIDA-01228 reference design and represents the metrology sub-system for a RF-enabled water or heat meter add-on module with inductive sensing.

# Title Duration
2.1 LC-sensing - a key sub-system in Smart Water and Heat meters
CC1350 Wireless MCU and TI FemtoFET devices implement a LC-sensing solution together with a Dual-band RF link, an InfraRed LED port and segment LCD SW...
2.2 LC-sensing flow measurement with TI FemtoFET and Wireless MCU
This training session shows a simple, yet ultra-low power LC-sensing solution with CC1350 Wireless MCU
2.3 Implementing LC-sensing with CC1350 SCE and FemtoFETs
Describes the optimized hardware and software implementation for the SCE of CC1350 Wireless MCU with FemtoFETs in TIDA-01228 for measuring disc rotati...
2.4 Test setup and results for LC-sensing design TIDA-01228
A a stepper motor with a rotating disc and a plate with precisely adjustable height down to 1um simulate the turning disc inside a mechanical water me...
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3. In-system tunable Multiband Sub-1GHz RF sub-system

Multiband Sub-1GHz RF sub-systems

# Title Duration
3.1 Multi-band Sub-1GHz tunable RF sub-system for smart meters
An innovative RF sub-system implements both tunable Balun and filter for CC1350 or CC1310 and adjusts "in-system" to the 315, 433, 868 and 915 MHz ISM...
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4. Bidirectional InfraRed PHY communication with a single IR LED

Some EU standards like EN1434-3 for heat meters require optical interface as per EN62056-21, where two separate IR LEDs are used (one for receive and one for transmit direction). TIDA-01212 shows an alternative approach, which uses a single IR LED to implement a bi-directional IrDA PHY link with 9.6 kbps in half-duplex mode. The design approach can  the system reduce cost of any smart (sub-)metering device by replacing the legacy optical IrDA PHY modules with two separate LEDs.

# Title Duration
4.1 Bidirectional InfraRed PHY communication with a single IR LED
Optimized software for CC1350 Sensor Controller Engine drives a single IR LED as both transmitter and receiver for IrDA PHY @ 9600 bps in ultra-low power...
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5. 7-segment LCD control thru SW and GPIOs

This module covers the “Innovative 7-Segment LCD Control Using GPIO Pins and SW” section of the “Single-chip Smart Water meter with Dual-band RF link and InfraRed port” training series.

# Title Duration
5.1 Innovative 7-Segment LCD Control Using GPIO Pins and SW
Innovative solution adds LCD functionality to any Smart Grid or IoT application, where 7-segment LCD operation is required but the LCD display is not always...
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