System radio transmission of liquid level data and battery saving technique
First Claim
1. System for radio transmission of liquid level data and for converting the received data to liquid volume data to be indicated, comprising;
- a transmitter comprisinga cell electric source,first means intermittently supplied with electric power from the source to convert liquid level data to corresponding electric signals,second means intermittently supplied with electric power from the source to convert said corresponding electric signals to corresponding frequency signals,modulation means intermittently supplied with electric power from the source to transmit the received frequency signals on carrier waves through an antenna,a computer normally maintained in a standby state,timer means for intermittently providing activation signals to the computer to place it in an activated state at a predetermined interval, andmeans for storing the last liquid level data to be inputted in the computer so that when the computer is activated said first means is actuated to give the electric signals representing the present level data to be inputted in the computer for comparison of the two data, wherein a transmitting period is selected to be longer in case where the last liquid level is higher than the present level and shorter in case where the last liquid level is lower than the present level, and after the transmission is over the last level data are cleared and the new level data are stored in said storing means; and
a receiver essentially comprisingfirst means for demodulation of the received frequency signals through an antenna,second means for storing data necessary for conversion in advance so as to convert the received liquid level data to liquid volume data,an indicator including the volume data, and wherein the storing means is adapted to set a counter number when detecting that the liquid level is not being raised up by comparison of said two level data so that the set number is decreased by one when the computer is activated to reach zero and then firstly the level signals are transmitted.
1 Assignment
0 Petitions
Accused Products
Abstract
System for radio transmission of level data of liquid contained in a tank and for converting to the level data to volume data to be indicated. A transmitter includes a cell for supplying electric power, a microcomputer connected to the cell and normally dept in a standby state in which it consumes a small amount of electric power. A timer is connected to the cell and the microcomputer to provide the latter with activation signals to place it in a activated state at a predetermined interval. A level detector if supplied with electric power from the cell only when the microcomputer is activated to provide the level data. A memory is continuously supplied with the electric power from the cell to memorize the level data, and a modulator supplied with the electric power from the cell only when the microcomputer is activated to transmit the level data in the memory by carrier waves through an antenna, whereby the system saves power consumption of the cell.
-
Citations
9 Claims
-
1. System for radio transmission of liquid level data and for converting the received data to liquid volume data to be indicated, comprising;
-
a transmitter comprising a cell electric source, first means intermittently supplied with electric power from the source to convert liquid level data to corresponding electric signals, second means intermittently supplied with electric power from the source to convert said corresponding electric signals to corresponding frequency signals, modulation means intermittently supplied with electric power from the source to transmit the received frequency signals on carrier waves through an antenna, a computer normally maintained in a standby state, timer means for intermittently providing activation signals to the computer to place it in an activated state at a predetermined interval, and means for storing the last liquid level data to be inputted in the computer so that when the computer is activated said first means is actuated to give the electric signals representing the present level data to be inputted in the computer for comparison of the two data, wherein a transmitting period is selected to be longer in case where the last liquid level is higher than the present level and shorter in case where the last liquid level is lower than the present level, and after the transmission is over the last level data are cleared and the new level data are stored in said storing means; and a receiver essentially comprising first means for demodulation of the received frequency signals through an antenna, second means for storing data necessary for conversion in advance so as to convert the received liquid level data to liquid volume data, an indicator including the volume data, and wherein the storing means is adapted to set a counter number when detecting that the liquid level is not being raised up by comparison of said two level data so that the set number is decreased by one when the computer is activated to reach zero and then firstly the level signals are transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification